Carbon Monoxide Alarms and Detectors

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Overall pick Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5-LP3 $23.44

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Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5-LP3
current price $23.44

Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5-LP3

4.6 out of 5 Stars. 359 reviews
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Basic CO Alarm w/ 9V Battery $19.59 Was $25.99

Basic CO Alarm w/ 9V Battery
current price Now $19.59, Was $25.99

Basic CO Alarm w/ 9V Battery

4.6 out of 5 Stars. 58 reviews
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100+ bought since yesterday Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators $27.47

100+ bought since yesterday
Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators
Available in additional 3 options
current price $27.47
Options from $27.47 – $164.82

Kidde AC Plug-In Carbon Monoxide Detector with Battery Backup, CO Alarm with LED Light Indicators

4.7 out of 5 Stars. 1470 reviews
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100+ bought since yesterday Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM $27.94

100+ bought since yesterday
Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM
Available in additional 3 options
current price $27.94
Options from $27.94 – $111.76

Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM

4.6 out of 5 Stars. 527 reviews
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Plug-In CO Alarm $25.22

Plug-In CO Alarm
current price $25.22

Plug-In CO Alarm

4.5 out of 5 Stars. 155 reviews
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Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5 $23.44

Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5
Available in additional 3 options
current price $23.44

Kidde AA Battery Operated Basic Carbon Monoxide Alarm - 9CO5

4.7 out of 5 Stars. 724 reviews
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Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector with Digital Display KN-COPP-3 $42.94

Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector with Digital Display KN-COPP-3
Available in additional 3 options
current price $42.94
Options from $42.94 – $128.82

Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector with Digital Display KN-COPP-3

4.6 out of 5 Stars. 213 reviews
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Kidde C3010D Carbon Monoxide Detector with Digital Display and 10-Year Worry-Free Lithium Battery, KIDDE $49.94

Kidde C3010D Carbon Monoxide Detector with Digital Display and 10-Year Worry-Free Lithium Battery, KIDDE
Available in additional 2 options
current price $49.94
Options from $49.94 – $99.88

Kidde C3010D Carbon Monoxide Detector with Digital Display and 10-Year Worry-Free Lithium Battery, KIDDE

4.5 out of 5 Stars. 66 reviews
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Outdoor-Forest Brand, Carbon Monoxide Detector, Orange Color, LCD Screen $28.96

Outdoor-Forest Brand, Carbon Monoxide Detector, Orange Color, LCD Screen
current price $28.96

Outdoor-Forest Brand, Carbon Monoxide Detector, Orange Color, LCD Screen

4.4 out of 5 Stars. 86 reviews
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GJX Portable 3-in-1 CO2 Meter Detector,High Precision Carbon Monoxide Sensor,Monitors Indoor Air Quality,Temperature,Humidity,Compact Handheld Device,TYPE-C Rechargeable,85x51x17mm $18.71 Was $21.51

GJX Portable 3-in-1 CO2 Meter Detector,High Precision Carbon Monoxide Sensor,Monitors Indoor Air Quality,Temperature,Humidity,Compact Handheld Device,TYPE-C Rechargeable,85x51x17mm
current price Now $18.71, Was $21.51

GJX Portable 3-in-1 CO2 Meter Detector,High Precision Carbon Monoxide Sensor,Monitors Indoor Air Quality,Temperature,Humidity,Compact Handheld Device,TYPE-C Rechargeable,85x51x17mm

5 out of 5 Stars. 1 reviews
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X-Sense Carbon Monoxide Detector Alarm with Digital LCD Display, Replaceable Battery CO Alarm Detector with Peak Value Memory, XC01-R $24.99

X-Sense Carbon Monoxide Detector Alarm with Digital LCD Display, Replaceable Battery CO Alarm Detector with Peak Value Memory, XC01-R
current price $24.99

X-Sense Carbon Monoxide Detector Alarm with Digital LCD Display, Replaceable Battery CO Alarm Detector with Peak Value Memory, XC01-R

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Plug-In CO Alarm w Digital Display $35.88 Was $44.00

Plug-In CO Alarm w Digital Display
current price Now $35.88, Was $44.00

Plug-In CO Alarm w Digital Display

4.5 out of 5 Stars. 165 reviews
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Knox Safety Battery Operated Carbon Monoxide Detector, Voice Alert & Display, 10-Year Lithium Power $41.97

Knox Safety Battery Operated Carbon Monoxide Detector, Voice Alert & Display, 10-Year Lithium Power
Available in additional 2 options
current price $41.97
Options from $41.97 – $75.00

Knox Safety Battery Operated Carbon Monoxide Detector, Voice Alert & Display, 10-Year Lithium Power

4.1 out of 5 Stars. 397 reviews
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Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & LCD Display, 10-Year Battery Backup $51.00

Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & LCD Display, 10-Year Battery Backup
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current price $51.00
Options from $51.00 – $153.00

Knox Safety Plugin Carbon Monoxide Detector, Voice Alert & LCD Display, 10-Year Battery Backup

4 out of 5 Stars. 186 reviews
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Vrorvz Portable Handheld CO2 Detector Accurate CO Sensor Monitors Indoor Air Quality Temperature Humidity for Home Tent Car RV Compact Lightweight,TYPE C Charging $13.79 Was $15.59

Vrorvz Portable Handheld CO2 Detector Accurate CO Sensor Monitors Indoor Air Quality Temperature Humidity for Home Tent Car RV Compact Lightweight,TYPE C Charging
current price Now $13.79, Was $15.59
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Vrorvz Portable Handheld CO2 Detector Accurate CO Sensor Monitors Indoor Air Quality Temperature Humidity for Home Tent Car RV Compact Lightweight,TYPE C Charging

5 out of 5 Stars. 1 reviews
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First Alert CO250B, White, 9-Volt Battery, Electrochemical Carbon Monoxide Alarm $29.36

First Alert CO250B, White, 9-Volt Battery, Electrochemical Carbon Monoxide Alarm
current price $29.36

First Alert CO250B, White, 9-Volt Battery, Electrochemical Carbon Monoxide Alarm

4.7 out of 5 Stars. 16 reviews
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Kidde Battery Operated Smoke & Carbon Monoxide Detector with LED Lights & Voice Alerts $43.00

Kidde Battery Operated Smoke & Carbon Monoxide Detector with LED Lights & Voice Alerts
current price $43.00

Kidde Battery Operated Smoke & Carbon Monoxide Detector with LED Lights & Voice Alerts

4.8 out of 5 Stars. 55 reviews
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Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,2-pack $56.99

Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,2-pack
Available in additional 3 options
current price $56.99
Options from $56.99 – $79.99

Siterwell AA Battery Operated Carbon Monoxide Detector Alarm, LCD Display,Portable for Travel Home,2-pack

4.6 out of 5 Stars. 110 reviews
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First Alert BRK SC9120B 85-Decibel Ionization Hardwired Smoke and Electrochemical Carbon Monoxide Detector with Battery Backup $82.99

First Alert BRK SC9120B 85-Decibel Ionization Hardwired Smoke and Electrochemical Carbon Monoxide Detector with Battery Backup
current price $82.99

First Alert BRK SC9120B 85-Decibel Ionization Hardwired Smoke and Electrochemical Carbon Monoxide Detector with Battery Backup

4.6 out of 5 Stars. 325 reviews
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Kidde Battery-Powered Electrochemical Carbon Monoxide Detector $44.44

Kidde Battery-Powered Electrochemical Carbon Monoxide Detector
Available in additional 2 options
current price $44.44
Options from $44.44 – $88.88

Kidde Battery-Powered Electrochemical Carbon Monoxide Detector

4.3 out of 5 Stars. 46 reviews
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Portable Carbon Monoxide Detector Alarm For Camping And Home Use Of The Day Home Decor $21.99

Portable Carbon Monoxide Detector Alarm For Camping And Home Use Of The Day Home Decor
current price $21.99
+$0.99 shipping

Portable Carbon Monoxide Detector Alarm For Camping And Home Use Of The Day Home Decor

2.5 out of 5 Stars. 2 reviews
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Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester $39.99

Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester
current price $39.99

Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester

3 out of 5 Stars. 4 reviews
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Kchsji Portable Handheld Quality Detector CO2 Temperature Humidity Monitor with High Precision Sensor for Home Office Tent Car RV Indoor Air Quality Safety Monitoring Carbon Dioxide Alert $15.50

Kchsji Portable Handheld Quality Detector CO2 Temperature Humidity Monitor with High Precision Sensor for Home Office Tent Car RV Indoor Air Quality Safety Monitoring Carbon Dioxide Alert
current price $15.50
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Kchsji Portable Handheld Quality Detector CO2 Temperature Humidity Monitor with High Precision Sensor for Home Office Tent Car RV Indoor Air Quality Safety Monitoring Carbon Dioxide Alert

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First Alert Dual-Power Carbon Monoxide Plug-in Alarm with Digital Display, 1039746PT $35.88 Was $47.23 $52.00/ea

First Alert Dual-Power Carbon Monoxide Plug-in Alarm with Digital Display, 1039746PT
current price Now $35.88, Was $47.23
$52.00/ea

First Alert Dual-Power Carbon Monoxide Plug-in Alarm with Digital Display, 1039746PT

5 out of 5 Stars. 1 reviews
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Clearance 3-in-1 Portable Handheld CO Detector with Temperature and Humidity Monitor - High Precision Carbon Monoxide Sensor for Home, Tent, Car, and RV Use $21.93 Was $24.37

Clearance
3-in-1 Portable Handheld CO Detector with Temperature and Humidity Monitor - High Precision Carbon Monoxide Sensor for Home, Tent, Car, and RV Use
current price Now $21.93, Was $24.37
+$2.33 shipping

3-in-1 Portable Handheld CO Detector with Temperature and Humidity Monitor - High Precision Carbon Monoxide Sensor for Home, Tent, Car, and RV Use

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SITERWELL Portable Plug in Carbon Monoxide (CO)Detector 10 Year Battery,Electrochemical,Sound Warning, AC Powered for Home Office Travel,2 pack $51.19 Was $63.99

SITERWELL Portable Plug in Carbon Monoxide (CO)Detector 10 Year Battery,Electrochemical,Sound Warning, AC Powered for Home Office Travel,2 pack
Available in additional 3 options
current price Now $51.19, Was $63.99
Options from $51.19 – $79.99

SITERWELL Portable Plug in Carbon Monoxide (CO)Detector 10 Year Battery,Electrochemical,Sound Warning, AC Powered for Home Office Travel,2 pack

4.4 out of 5 Stars. 26 reviews
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Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM $27.17

Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM
current price $27.17

Kidde Battery Operated Carbon Monoxide Alarm with Digital Display KN-COPP-B-LPM

4.5 out of 5 Stars. 212 reviews
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TOPTES Carbon Monoxide Detector CT-300, Handheld CO Alarm with Backlit LCD Display and Audible Visual Alerts, for Home, Car, Camping and Travel $45.99

TOPTES Carbon Monoxide Detector CT-300, Handheld CO Alarm with Backlit LCD Display and Audible Visual Alerts, for Home, Car, Camping and Travel
current price $45.99

TOPTES Carbon Monoxide Detector CT-300, Handheld CO Alarm with Backlit LCD Display and Audible Visual Alerts, for Home, Car, Camping and Travel

4.5 out of 5 Stars. 13 reviews
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Universal Security Instruments, Sensing Plus, Combo Smoke, Fire, and Carbon Monoxide Alarm, Multi-Criteria, with 10-Year Battery $58.00

Universal Security Instruments, Sensing Plus, Combo Smoke, Fire, and Carbon Monoxide Alarm, Multi-Criteria, with 10-Year Battery
current price $58.00

Universal Security Instruments, Sensing Plus, Combo Smoke, Fire, and Carbon Monoxide Alarm, Multi-Criteria, with 10-Year Battery

4.9 out of 5 Stars. 7 reviews
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Safe-T-Alert. 85-741-WT-TR, 85 Series Universal Dual CO/LP Detector with Trim Ring, White $63.25 $63.25/count

Safe-T-Alert. 85-741-WT-TR, 85 Series Universal Dual CO/LP Detector with Trim Ring, White
current price $63.25
$63.25/count

Safe-T-Alert. 85-741-WT-TR, 85 Series Universal Dual CO/LP Detector with Trim Ring, White

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Yrmaups CO2 Detector, Portable Handheld Air Quality Monitor with Temperature and Humidity Sensor, 3-in- Carbon Monoxide Tester for Home, Office, Car and RV, Indoor Air Quality Meter $21.99

Yrmaups CO2 Detector, Portable Handheld Air Quality Monitor with Temperature and Humidity Sensor, 3-in- Carbon Monoxide Tester for Home, Office, Car and RV, Indoor Air Quality Meter
current price $21.99

Yrmaups CO2 Detector, Portable Handheld Air Quality Monitor with Temperature and Humidity Sensor, 3-in- Carbon Monoxide Tester for Home, Office, Car and RV, Indoor Air Quality Meter

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Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester $40.99

Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester
current price $40.99

Handheld Carbon Monoxide Meter CO Detector Portable CO Gas Leak Detector High Precision Carbon Monoxide Tester

4 out of 5 Stars. 3 reviews
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FACEGA Mini Carbon Monoxide Detector 0-999ppm Portable CO Gas Detector LCD Display Handheld Smoke Carbon Monoxide Monitor Battery Operated Carbon Monoxide Alarm Sensor for Hotel Dorm RV $15.84

FACEGA Mini Carbon Monoxide Detector 0-999ppm Portable CO Gas Detector LCD Display Handheld Smoke Carbon Monoxide Monitor Battery Operated Carbon Monoxide Alarm Sensor for Hotel Dorm RV
current price $15.84

FACEGA Mini Carbon Monoxide Detector 0-999ppm Portable CO Gas Detector LCD Display Handheld Smoke Carbon Monoxide Monitor Battery Operated Carbon Monoxide Alarm Sensor for Hotel Dorm RV

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Fufafayo under $5 Carbon Monoxide Detector, Portable CO Alarm, Air Quality Monitor with LCD Decor, Home Safety Device for Camping, RV, Bedroom, Kitchen $21.99

Fufafayo under $5 Carbon Monoxide Detector, Portable CO Alarm, Air Quality Monitor with LCD Decor, Home Safety Device for Camping, RV, Bedroom, Kitchen
A1524 Fufafayo under $5, variant on Fufafayo under $5 Carbon Monoxide Detector, Portable CO Alarm, Air Quality Monitor with LCD Decor, Home Safety Device for Camping, RV, Bedroom, Kitchen
A1526 Fufafayo under $5, variant on Fufafayo under $5 Carbon Monoxide Detector, Portable CO Alarm, Air Quality Monitor with LCD Decor, Home Safety Device for Camping, RV, Bedroom, Kitchen
current price $21.99

Fufafayo under $5 Carbon Monoxide Detector, Portable CO Alarm, Air Quality Monitor with LCD Decor, Home Safety Device for Camping, RV, Bedroom, Kitchen

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First Alert Plug-In w/Battery Back-up Electrochemical Carbon Monoxide Detector $74.97

First Alert Plug-In w/Battery Back-up Electrochemical Carbon Monoxide Detector
current price $74.97

First Alert Plug-In w/Battery Back-up Electrochemical Carbon Monoxide Detector

4.7 out of 5 Stars. 18 reviews
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Best seller MTI Industries 35-742-WT Safe T Alert 35 Series Dual LP/CO Alarm - Flush Mount, White $91.99

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MTI Industries 35-742-WT Safe T Alert 35 Series Dual LP/CO Alarm - Flush Mount, White
Brown, variant on MTI Industries 35-742-WT Safe T Alert 35 Series Dual LP/CO Alarm - Flush Mount, White
White, variant on MTI Industries 35-742-WT Safe T Alert 35 Series Dual LP/CO Alarm - Flush Mount, White
current price $91.99
Options from $91.99 – $99.79

MTI Industries 35-742-WT Safe T Alert 35 Series Dual LP/CO Alarm - Flush Mount, White

4.5 out of 5 Stars. 76 reviews
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First Alert GCO1CN Combination Explosive Gas and Carbon Monoxide Alarm with Backlit Digital Display $70.99

First Alert GCO1CN Combination Explosive Gas and Carbon Monoxide Alarm with Backlit Digital Display
current price $70.99

First Alert GCO1CN Combination Explosive Gas and Carbon Monoxide Alarm with Backlit Digital Display

4.3 out of 5 Stars. 86 reviews
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GJX 1Pc Handheld Carbon Monoxide Detector Co Detector With Digital Lcd Display Natural Gas Alarm Co Gas Tester Monitor Detector $15.90

GJX 1Pc Handheld Carbon Monoxide Detector Co Detector With Digital Lcd Display Natural Gas Alarm Co Gas Tester Monitor Detector
current price $15.90

GJX 1Pc Handheld Carbon Monoxide Detector Co Detector With Digital Lcd Display Natural Gas Alarm Co Gas Tester Monitor Detector

5 out of 5 Stars. 1 reviews
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Werulen Portable CO2 Air Quality Detector, Handheld Indoor Carbon Monoxide Monitor with Temperature Humidity Sensor, 3-in- Multifunctional Tester for Home Car RV Travel Safety $20.99

Werulen Portable CO2 Air Quality Detector, Handheld Indoor Carbon Monoxide Monitor with Temperature Humidity Sensor, 3-in- Multifunctional Tester for Home Car RV Travel Safety
current price $20.99

Werulen Portable CO2 Air Quality Detector, Handheld Indoor Carbon Monoxide Monitor with Temperature Humidity Sensor, 3-in- Multifunctional Tester for Home Car RV Travel Safety

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Airthings Wave Mini - Indoor Air Quality Monitor with Mold-Risk Indication $69.69 Was $79.99

Airthings Wave Mini - Indoor Air Quality Monitor with Mold-Risk Indication
current price Now $69.69, Was $79.99

Airthings Wave Mini - Indoor Air Quality Monitor with Mold-Risk Indication

4.4 out of 5 Stars. 39 reviews
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About Carbon Monoxide Alarms and Detectors - Walmart.com

What are the main types of carbon monoxide detectors?

The main kinds of carbon monoxide detectors available at Walmart include sealed battery detectors, replaceable battery detectors, and smart carbon monoxide detectors. Smoke detectors with sealed battery are very common, and you don't need to change the battery, which lasts up to 10 years. If you want a detector with a longer lifespan, opt for one with replaceable batteries. Smart carbon monoxide detectors work with an application on your smartphone to alert you about an incident at home no matter where you are.

How do I choose the best carbon monoxide detector?

Look at how loud the alarm of the detector is, and try to choose a model that allows you to interconnect all rooms. This way, when a hazard is detected, the alarm is triggered simultaneously around the home, ensuring you have a quicker response time.

Is it important to get a model with a digital display?

A carbon monoxide detector with a digital display informs you when the battery is about to run out and can provide you with constant readouts of measured CO levels.

FAQ

What causes a carbon monoxide alarm to go off unexpectedly?

Carbon monoxide alarms can be triggered by several factors beyond actual CO presence. Common causes include:

  • Low battery: Many alarms beep intermittently to signal battery replacement is needed.
  • End of sensor life: Sensors degrade over time and may cause false alarms.
  • Environmental factors: High humidity, steam, or strong chemicals can interfere with sensors.
  • Power issues: For plug-in models, power surges or outages might cause alerts.

Regular maintenance and following manufacturer guidelines can help minimize unexpected alarms.

Where is the safest place to install a carbon monoxide detector at home?

Choosing the right spot for a carbon monoxide detector is key for effective monitoring. Consider these tips:

  • Install detectors near sleeping areas so alarms can be heard clearly at night.
  • Place them on each level of your home, including basements.
  • Avoid installing detectors right next to fuel-burning appliances to prevent false alarms.
  • Mount detectors on the wall about 5 feet above the floor or on the ceiling, following the product instructions.

Proper placement helps ensure early detection and safety.

How can I tell if my home has dangerous carbon monoxide levels?

Carbon monoxide is odorless and colorless, so detection relies on alarms designed for this purpose. Signs to watch for include:

  • Activation of a carbon monoxide alarm with a loud, distinct sound.
  • Digital displays on some alarms showing elevated CO levels.
  • Feeling symptoms like headache, dizziness, or nausea, which should prompt immediate action and professional help.

Using reliable carbon monoxide detectors and regularly testing them helps provide peace of mind about your home's safety.

Why does my carbon monoxide detector keep beeping even when no CO is detected?

Intermittent beeping without CO detection often indicates maintenance needs or device alerts such as:

  • Low battery warning: Most battery-powered alarms beep to signal it's time to replace batteries.
  • End of device life: Some alarms beep to indicate the sensor or unit needs replacement after several years.
  • Malfunction or error: Dust, dirt, or sensor issues might cause false alerts.

Consult the alarm's manual for specific beep codes and consider replacing batteries or the unit if needed.

What features should I look for when buying a carbon monoxide alarm?

When choosing a carbon monoxide alarm, consider features that enhance safety and convenience:

  • Power source: Options include battery-operated, plug-in with battery backup, or hardwired models.
  • Digital display: Shows real-time CO levels and peak readings for better monitoring.
  • End-of-life warning: Alerts when the alarm needs replacement.
  • Test/reset button: Allows you to check functionality easily.
  • Certification: Look for alarms meeting recognized safety standards.

These features help ensure reliable detection and ease of use in your home.

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