Wonderful Carbon Monoxide Detectors. Reviews July, 2021, page 7

First Alert Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location, SC500-3

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Search only FIRST ALERT brand name
First Alert Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location, SC500-3

Current price: 128.99 USD


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Height: 9 Inches

Length: 10.75 Inches

Width: 7.125 Inches

Weight: 2.45 Pounds

Warranty: 7-YEAR LIMITED WARRANTY

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm

More Info

Ring Alarm Smoke and CO Listener 2-Pack

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Search only Ring brand name
Ring Alarm Smoke and CO Listener 2-Pack

Current price: 69.98 USD


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  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.

More Info

Kidde Smoke and Carbon Monoxide Detector Alarm with Voice Warning | Battery Operated | Model # KN-COSM-BA | 6 Pack

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Search only Kidde brand name
Kidde Smoke and Carbon Monoxide Detector Alarm with Voice Warning | Battery Operated | Model # KN-COSM-BA | 6 Pack

Current price: 147.99 USD

Saving: $22.00 (13%)


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Height: 7.3 Inches

Length: 12.2 Inches

Width: 6.7 Inches

Weight: 1 Pounds

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.

More Info

Onelink by FIRST ALERT Smoke Detector and Carbon Monoxide Detector | Hardwired | First Alert

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Search only FIRST ALERT brand name
Onelink by FIRST ALERT Smoke Detector and Carbon Monoxide Detector | Hardwired | First Alert

Current price: 108 USD

Saving: $11.99 (10%)


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Height: 1.57 Inches

Length: 5.88 Inches

Width: 5.88 Inches

Weight: 0.75 Pounds

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor

More Info

Kidde Smoke & Carbon Monoxide Detector, Lithium Battery Powered, Combination Smoke & CO Alarm with Voice Alert

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Search only Kidde brand name
Kidde Smoke & Carbon Monoxide Detector, Lithium Battery Powered, Combination Smoke & CO Alarm with Voice Alert

Current price: 47.91 USD


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Height: 5.22 Inches

Length: 5.22 Inches

Width: 1.6 Inches

Warranty: 10 year limited

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"

More Info

First Alert Carbon Monoxide Detector Alarm|No Outlet Required with Digital Display and Peak Memory, Battery Operated, CO410

More from Tools & Home Improvement
Search only FIRST ALERT brand name
First Alert Carbon Monoxide Detector Alarm|No Outlet Required with Digital Display and Peak Memory, Battery Operated, CO410

Current price: 30.88 USD

Saving: $5.45 (15%)


Check price and availability


Height: 8.5 Inches

Length: 2.25 Inches

Width: 7 Inches

Weight: 0.5813 Pounds

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • All First Alert CO alarms are rigorously tested to meet UL standards
  • 7 year limited warranty; equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • A loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
  • Features an advanced electrochemical carbon monoxide sensor; Peak Level feature displays the highest concentration of carbon monoxide measured
  • Keep your family safe with this easy to use digital display, battery operated carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure

More Info

First Alert BRK SCO2B Smoke and Carbon Monoxide (CO) Detector with 9V Battery

More from Tools & Home Improvement
Search only FIRST ALERT brand name
First Alert BRK SCO2B Smoke and Carbon Monoxide (CO) Detector with 9V Battery

Current price: 27.8 USD

Saving: $12.19 (30%)


Check price and availability


Height: 2 Inches

Length: 5.6 Inches

Width: 5.6 Inches

Weight: 0.59 Pounds

Warranty: 7 Year Limited Warranty

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • All First Alert CO alarms are rigorously tested to meet UL standards
  • 7 year limited warranty; equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • A loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
  • Features an advanced electrochemical carbon monoxide sensor; Peak Level feature displays the highest concentration of carbon monoxide measured
  • Keep your family safe with this easy to use digital display, battery operated carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • It can ship within the US except New York and California
  • Two Locking Features Pins Lock Battery Drawer and/or Alarm to Base
  • End of Life Signal Provides Audible Notice When Alarm Needs to be Replaced
  • Latching Alarm Indicator Remembers Which Unit Initiated an Alarm
  • Electrochemical CO Sensor is the most accurate technology available
  • Separate Smoke and CO detects both dangers and eliminates the need for two separate alarms
  • Latching alarm indicator remembers which unit initiated an alarm
  • Electrochemical co sensor is the most accurate technology available
  • Separate smoke and co detects both dangers and eliminates the need for two separate alarms

More Info

Ring Alarm Smoke and CO Listener

More from Tools & Home Improvement
Search only Ring brand name
Ring Alarm Smoke and CO Listener

Current price: 34.99 USD


Check price and availability


Weight: 0.0440924524 Pounds

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • All First Alert CO alarms are rigorously tested to meet UL standards
  • 7 year limited warranty; equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • A loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
  • Features an advanced electrochemical carbon monoxide sensor; Peak Level feature displays the highest concentration of carbon monoxide measured
  • Keep your family safe with this easy to use digital display, battery operated carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • It can ship within the US except New York and California
  • Two Locking Features Pins Lock Battery Drawer and/or Alarm to Base
  • End of Life Signal Provides Audible Notice When Alarm Needs to be Replaced
  • Latching Alarm Indicator Remembers Which Unit Initiated an Alarm
  • Electrochemical CO Sensor is the most accurate technology available
  • Separate Smoke and CO detects both dangers and eliminates the need for two separate alarms
  • Latching alarm indicator remembers which unit initiated an alarm
  • Electrochemical co sensor is the most accurate technology available
  • Separate smoke and co detects both dangers and eliminates the need for two separate alarms
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.

More Info

First Alert SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location

More from Tools & Home Improvement
Search only FIRST ALERT brand name
First Alert SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location

Current price: 38.48 USD

Saving: $2.69 (7%)


Check price and availability


Height: 5.13 Inches

Length: 5.13 Inches

Width: 2.38 Inches

Weight: 0.6 Pounds

Warranty: 7

  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • All First Alert CO alarms are rigorously tested to meet UL standards
  • 7 year limited warranty; equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • A loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
  • Features an advanced electrochemical carbon monoxide sensor; Peak Level feature displays the highest concentration of carbon monoxide measured
  • Keep your family safe with this easy to use digital display, battery operated carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • It can ship within the US except New York and California
  • Two Locking Features Pins Lock Battery Drawer and/or Alarm to Base
  • End of Life Signal Provides Audible Notice When Alarm Needs to be Replaced
  • Latching Alarm Indicator Remembers Which Unit Initiated an Alarm
  • Electrochemical CO Sensor is the most accurate technology available
  • Separate Smoke and CO detects both dangers and eliminates the need for two separate alarms
  • Latching alarm indicator remembers which unit initiated an alarm
  • Electrochemical co sensor is the most accurate technology available
  • Separate smoke and co detects both dangers and eliminates the need for two separate alarms
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • Voice alarm gives clear indication of what the danger is and where it is located
  • When one alarm sounds, all alarms will sound
  • When your alarms are interconnected, they communicate with each other, forming an integrated system of protection for your home
  • Connects multiple alarms together for wireless safety network (not z-wave compatible)
  • Wireless interconnect uses radio frequency communication to connect the alarms, without any electrical wiring needed.
  • Battery operated smoke and carbon monoxide alarm can be installed easily

More Info

Combination Smoke and Carbon Monoxide Detector Smoke Alarm, WJZXTEK 2Pack Smoke and Carbon Detector Alarm with Beeps Voice Warning, Power Detection Electronic Equipment, Comply with UL217/UL2034

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Combination Smoke and Carbon Monoxide Detector Smoke Alarm, WJZXTEK 2Pack Smoke and Carbon Detector Alarm with Beeps Voice Warning, Power Detection Electronic Equipment, Comply with UL217/UL2034

Current price: 27.99 USD


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  • One button silences a false alarm and tests the unit
  • Features photoelectric smoke sensor and electrochemical CO sensor
  • Voice alarm gives clear indication of where the problem is located
  • Connects multiple alarms together for wireless safety network
  • Battery-operated smoke and carbon monoxide alarm
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke, or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • The unit shall at a minimum meet the requirements of UL 2034, UL217, NFPA72, (chapter 11 2002 edition) The State of California Fire Marshall, NFPA101 (One and two family dwellings) Federal Housing Authority (FHA), Housing and Urban Development (HUD). It shall also include a 7-year manufacturer’s limited warranty
  • easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty.
  • Ionization Smoke Alarm Sensor
  • Battery Safeguard – The battery door will not close unless the batteries are properly installed.
  • Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur
  • Temperature Range:40˚F (4.4˚C) to 100˚F (37.8˚C)
  • Low Battery Warning – The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.
  • Test/Reset Button – Tests alarm circuitry and triggers the voice announcement.
  • Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installa-tion time and helps to keep home décor attractive
  • Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
  • INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected
  • COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
  • HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
  • A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
  • MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
  • SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
  • UL Certified, 10-year limited warranty
  • Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling
  • Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery
  • Photoelectric & Electrochemical sensor technologies - smoke detector detects invisible fire particles,while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire
  • Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire! Fire!", "Warning! Carbon Monoxide!", or "Low Battery!"
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • All First Alert CO alarms are rigorously tested to meet UL standards
  • 7 year limited warranty; equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • A loud 85 decibel alarm sounds when Carbon Monoxide levels reach dangerous levels
  • Features an advanced electrochemical carbon monoxide sensor; Peak Level feature displays the highest concentration of carbon monoxide measured
  • Keep your family safe with this easy to use digital display, battery operated carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • It can ship within the US except New York and California
  • Two Locking Features Pins Lock Battery Drawer and/or Alarm to Base
  • End of Life Signal Provides Audible Notice When Alarm Needs to be Replaced
  • Latching Alarm Indicator Remembers Which Unit Initiated an Alarm
  • Electrochemical CO Sensor is the most accurate technology available
  • Separate Smoke and CO detects both dangers and eliminates the need for two separate alarms
  • Latching alarm indicator remembers which unit initiated an alarm
  • Electrochemical co sensor is the most accurate technology available
  • Separate smoke and co detects both dangers and eliminates the need for two separate alarms
  • Optional 24/7 professional monitoring is just $10/month. No contracts or cancellation fees.
  • Battery life 3 years max. Batteries are replaceable.
  • Manage Ring Alarm Smoke and CO Listener and other Ring products with the Ring app.
  • Easy setup in minutes—without tools or professional installation. Requires Ring Alarm Security System (sold separately).
  • This device does not detect fire, smoke or carbon monoxide and is intended to work with UL listed smoke and CO detectors that are 10 years old or less.
  • Ring Alarm Smoke and CO Listener alerts you on your smart phone when your existing smoke and carbon monoxide detectors sound their alarms.
  • Voice alarm gives clear indication of what the danger is and where it is located
  • When one alarm sounds, all alarms will sound
  • When your alarms are interconnected, they communicate with each other, forming an integrated system of protection for your home
  • Connects multiple alarms together for wireless safety network (not z-wave compatible)
  • Wireless interconnect uses radio frequency communication to connect the alarms, without any electrical wiring needed.
  • Battery operated smoke and carbon monoxide alarm can be installed easily
  • Simple to use, A single button tests the unit or silences the alarm. Low battery signal mute, quiets low battery signal for up to 8 hours
  • Battery-operated unit installs quickly and easily without an electrician,Can connect to other compatible detectors, to ensure all alarms will sound when threat is detected
  • Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85dB siren provides a clear, loud warning upon detection
  • Features an electrochemical Carbon Monoxide sensing technology as well as a photoelectric sensor that detects the larger particles of a smoldering fire
  • Keep your family safe with this battery operated smoke and carbon monoxide alarm; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure

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