Best Carbon Monoxide Alarm of 2026

Last updated on 04/04/2026
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Best Choice
1
9.7
Exceptional
Save 23%
FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home w/Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor w/Test Button - 2-Pack
Fireangel

FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home w/Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor w/Test Button - 2-Pack

23% Off
Why we love it
  • Alerts with flashing lights.
  • Test button ensures functionality.
  • Includes replaceable AA batteries.
Main Highlights
  • CARBON MONOXIDE ALARMS FOR HOME USE: The advanced electrochemical sensor detects dangerous levels of carbon monoxide (CO) in your home, alerting you with 4 loud chirps (85 dB(A) at 3 metres) and a flashing red ‘CO’ LED light. NEVER IGNORE THIS ALARM.
  • TEST BUTTON: Press the large test button to ensure your CO detector is working properly. A loud, high-pitched sound and the red LED flashing four times will verify that the alarm is functioning correctly.
  • BATTERIES INCLUDED: Each CO monitor comes with 2 replaceable AA batteries. A flashing amber '!' and an audible chirp will alert you when the batteries need replacing. Test your FireAngel carbon monoxide alarm regularly to ensure it is operational.
  • SLEEP EASY FUNCTION: Press the large test button to silence the low battery alert. This activates the Sleep Easy mode on the carbon monoxide monitor, muting the low battery chirp for 8 hours whilst the amber light flashes. Replace the batteries ASAP.
  • TRAVEL CARBON MONOXIDE DETECTOR: Each compact device measures 120 x 73 x 35.5 mm and comes with an integrated mounting bracket and screws, allowing for easy wall mounting. With 2 devices per pack, take 1 with you for on the go holiday protection.
  • SAFETY ASSURED: The FA6813 detector holds a CE & UKCA mark and has been designed to conform to the standards BS EN 50291-1: 2008 and EN 50291-2: 2019. Suitable for homes in England and Wales, but not for Scottish homes under the new regulations.
  • FIREANGEL HOME PROTECTION: In addition to our carbon monoxide detectors, we offer a wide range of other safety products designed to protect you and your family. Choose from smart and wireless devices, as well as standard fire, smoke, and heat alarms.
9.7
Exceptional
Save 23%
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🛡️Trusted by 100M+ UsersWhy?
Best Value
2
9.6
Superb
Twin Pack Kidde 5CO Battery Powered Carbon Monoxide Alarm and Detector - 10 Year Sensor Life with AA Batteries
Kidde

Twin Pack Kidde 5CO Battery Powered Carbon Monoxide Alarm and Detector - 10 Year Sensor Life with AA Batteries

Why we love it
  • Accurate carbon monoxide detection.
  • Portable with sleek design.
  • End of life alert.
Main Highlights
  • BATTERY POWERED: Each alarm comes equipped with 2x AA batteries included, allowing your alarm to be set up immediately upon receipt
  • 7 YEAR WARRANTY: Enjoy peace of mind knowing your alarm is protected with an extensive seven year manufacturer’s warranty
  • FREE STANDING OR WALL MOUNTED: For ease of installation, the Kidde 5CO model can be placed free standing on any surface, or can be wall mounted with the included screws and wall plugs
  • LIGHTWEIGHT & COMPACT: The 5CO’s sleek design allows this life-saving device to blend into your décor, while remaining uncompromising on its strict quality testing
  • LOUD & ACCURATE ALARM: From just 50ppm of CO in the air, the Kidde 5CO will emit a loud 85db piercing alarm alerting occupants to the presence of carbon monoxide
  • SAFETY APPROVED: CE and UKCA marked, and Kitemarked to the most up-to-date British Standards Institute (BSI) standard for carbon monoxide alarms (BS EN 50291-1:2018)
9.6
Superb
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3
9.4
Superb
FireAngel Carbon Monoxide Detector 10-Year Life Sealed Battery - FA3820 Carbon Monoxide Alarm for Home and Holiday - Portable CO Alarm - Travel Carbon Monoxide Detector and Monitor - White
Fireangel

FireAngel Carbon Monoxide Detector 10-Year Life Sealed Battery - FA3820 Carbon Monoxide Alarm for Home and Holiday - Portable CO Alarm - Travel Carbon Monoxide Detector and Monitor - White

Why we love it
  • Loud alarm alerts immediately.
  • Certified by British Standards.
  • Portable and versatile design.
Main Highlights
  • CARBON MONOXIDE ALARMS FOR HOME USE: The advanced electrochemical sensor detects dangerous levels of carbon monoxide (CO) in your home, alerting you with 4 loud chirps (85 dB(A) at 3 metres) and a flashing red ‘CO’ LED light.
  • ENHANCED SENSING: The alarm’s high sensitivity mode will activate if it predicts that CO levels will rise to or above 180 ppm, providing a quicker alert and a ‘pre alarm’ with a visual instruction to ‘ventilate'.
  • 10-YEAR SEALED FOR LIFE BATTERY: Each CO monitor is fitted with a sealed, tamper proof, 10 year battery that will last the lifetime of the alarm. A flashing amber '!' and an audible beep will alert you when the device needs replacing.
  • ALARM MEMORY: Your device will notify you of a CO alarm in your absence. If not silenced, the alarm will continue to sound until CO levels are safe. The red ‘CO’ light will continue flashing as a visual indication of a previous activation.
  • PORTABLE CARBON MONOXIDE DETECTOR: Measuring 125 x 67 x 33 mm, this compact, free standing device is travel friendly and provides protection wherever you go. It also includes an integrated mounting bracket and screws for easy wall mounting.
  • SAFETY ASSURED: Suitable for all domestic and rental premises, the FA3820 carbon monoxide monitor is UKCA marked, Kitemark certified, and third-party approved by the British Standards Institute (BSI) to BS EN 50291-1:2018 and EN 50291-2:2019.
  • FIREANGEL HOME PROTECTION: In addition to our carbon monoxide detectors, we offer a wide range of other safety products designed to protect you and your family. Choose from smart and wireless devices, as well as standard fire, smoke, and heat alarms.
9.4
Superb
Amazon Logo
4
9.3
Superb
Save 42%
Carbon Monoxide Detector with LCD Digital Display, CE Certified CO Alarm with Sealed in 10 Year Battery, Standalone Audible CO Detector for Home,White,1 Pack
XINDUM

Carbon Monoxide Detector with LCD Digital Display, CE Certified CO Alarm with Sealed in 10 Year Battery, Standalone Audible CO Detector for Home,White,1 Pack

42% OffLimited time deal
Why we love it
  • High accuracy CO detection.
  • Loud and clear alarm.
  • Hassle-free battery operation.
Main Highlights
  • Accurate Relialbel CO Detector: Comply with EN 50291 standard, CE Certified Carbon Monoxide alarm, equipped with high accuracy and reliable electrochemical sensor, continuously measure CO concentration in ambient air.
  • Loud Alarm Warning: Carbon Monoxide can't be found with human natural senses. You can see real-time CO levels on LCD display. When a dangerous level of carbon monoxide is detected, the red LED will flash and the 85dB audible alarm will alert your families.
  • 10 Year Battery Operated: The CO Alarm is equipped with 1600mAh Lithium battery (Sealed In). No wiring and sockets required. It can be placed anywhere you want.
  • Easy Intsalltion: The CO alarm can stand freely on the desk, also can be wall mounted with double side tape without drill, or drill to install with screw kits. With the bracket, the CO detector also can be taken down even wall mounted.
  • Low Battery & End of Life Warning: If the battery is low , the CO alarm beeps once every 60 seconds, and the yellow LED indicator flashes once. If the CO detector reaches the end of service life,the carbon monoxide beeps twice every 30 seconds, and Yellow LED indicator flashes twice.
9.3
Superb
Save 42%
Limited time deal
Amazon Logo
5
9.2
Superb
X-Sense Carbon Monoxide Detector, Replaceable Battery Powered CO Alarm with Digital Display, Portable Carbon Monoxide Alarm for Home with CO Peak Value Memory, XC0C-SR, 1-Pack
X-Sense

X-Sense Carbon Monoxide Detector, Replaceable Battery Powered CO Alarm with Digital Display, Portable Carbon Monoxide Alarm for Home with CO Peak Value Memory, XC0C-SR, 1-Pack

Why we love it
  • 10-year reliable protection.
  • Versatile placement options.
  • Sleek and compact design.
Main Highlights
  • 10-Year Lifespan: Protect your loved ones from the silent threat of carbon monoxide for an entire decade with this reliable 10-year CO sensor; powered by replaceable AA batteries that last 3 years
  • Versatile Placement Options: This carbon monoxide detector's freestanding design allows you to place it on any flat surface, such as a desk, bookshelf, or bedside table; screws are also included to mount it on the wall
  • Sleek and Compact: Measuring just 75 × 142 × 32 mm, this small and unobtrusive carbon monoxide alarm looks good in any room, meaning you never have to compromise style for safety
  • Intuitive to Use: Easily use this alarm even in urgent situations thanks to its simple, size-differentiated buttons; enjoy reliable access to critical functions like checking the peak CO levels or testing/silencing the alarm
  • Easy to Understand: See the current CO level on a clear display; a tri-color LED tells you the alarm’s status at a glance: red for alarm, yellow for fault or low battery, and green for working normally
9.2
Superb
Amazon Logo
6
9.1
Superb
Kidde 7DCOC 7DCO Kidde Carbon Monoxide Alarm, White
Kidde

Kidde 7DCOC 7DCO Kidde Carbon Monoxide Alarm, White

Why we love it
  • Includes replaceable batteries.
  • Continuous CO level display.
  • 10-year sensor warranty.
Main Highlights
  • Battery operated (3AA’s included)
  • Two LED’s - Red: Illuminates when in alarm mode, Green: Illuminates when DC power is present, normal operation
  • Test/reset button tests CO alarm circuit operation and allows you to immediately silence the alarm
  • Digital display continuously displays CO levels detected
  • End of life alarm alerts user to replace the alarm after 10-years protection
  • It has replaceable batteries
  • 10 years sensor and warranty
  • Warning! this CO alarm is not a substitute for a smoke or fire alarm
9.1
Superb
Amazon Logo
7
9.0
Superb
Kidde 5DCO Digital Carbon Monoxide Alarm and Detector with AA Batteries - 10 Year Sensor Life Digital Display CO Alarm - 7 Year Warranty
Kidde

Kidde 5DCO Digital Carbon Monoxide Alarm and Detector with AA Batteries - 10 Year Sensor Life Digital Display CO Alarm - 7 Year Warranty

Why we love it
  • Compact and lightweight design.
  • Long-lasting sensor lifespan.
  • Clear digital CO level display.
Main Highlights
  • Compact, slimline case. Dimensions = 127mm x 73mm x 39mm. Weight = 170g.
  • 10 year sensor lifespan. Powered by two replaceable AA batteries (supplied).
  • Warning "chirp" and digital display message indicates when batteries are low.
  • Digital display of CO levels from 30ppm. Detector alarms from 50ppm.
  • Kitemarked to BS EN 50291-1 (domestic use). CE and UKCA marked
9.0
Superb
Amazon Logo
8
8.8
Excellent
Save 5%
FireAngel FA6812 Digital Carbon Monoxide Detector with LCD Screen, 10-Year CO Alarm Sensor, Portable Carbon Monoxide Alarm for Home, Travel, Caravan
Fireangel

FireAngel FA6812 Digital Carbon Monoxide Detector with LCD Screen, 10-Year CO Alarm Sensor, Portable Carbon Monoxide Alarm for Home, Travel, Caravan

5% Off
Why we love it
  • Reliable 10-year sensor technology.
  • Clear LCD display for alerts.
  • Includes batteries for convenience.
Main Highlights
  • CARBON MONOXIDE ALARM: The 10-year electrochemical sensor detects dangerous carbon monoxide (CO) levels, alerting with 4 loud chirps and a flashing red light. With no intervention, it switches to Alarm in Absence mode, chirping until deactivated.
  • LCD SCREEN: The LCD screen displays standby mode for current CO levels, active CO alarm, ‘AL’ alarm in absence, battery status, and ‘EOL’ end of life alert to indicate when the device needs to be replaced.
  • BATTERIES INCLUDED: Each CO monitor comes with 2 replaceable AA batteries. A flashing amber ‘!’ and continuous chirping indicate a low battery. Replace the batteries to stop the warning.
  • TRAVEL CARBON MONOXIDE DETECTORS: Each portable, free standing device measures 120 x 73 x 35.5 mm and includes an integrated mounting bracket and screws for optional wall mounting.
  • SAFETY ASSURED: The FA6812 Fire Angel carbon monoxide alarm is CE marked and complies with the standards BS EN 50291-1:2018 and BS EN 50291-2:2019.
8.8
Excellent
Save 5%
Amazon Logo
9
8.7
Excellent
Kidde Carbon Monoxide Alarm
Kidde

Kidde Carbon Monoxide Alarm

Why we love it
  • Continuous monitoring ensures safety.
  • Battery operation for portability.
  • End-of-life alarm feature.
Main Highlights
  • Continuous monitoring
  • End-of-life alarm
  • Test/reset button
  • Battery operation
  • Multi-function green and red LED's
  • Warning! this CO alarm is not a substitute for a smoke or fire alarm
8.7
Excellent
Amazon Logo
10
8.7
Excellent
Kidde 2030-DCR Compact 10 Year Life Carbon Monoxide Alarm with AA batteries
Kidde

Kidde 2030-DCR Compact 10 Year Life Carbon Monoxide Alarm with AA batteries

Why we love it
  • Clear, loud CO alarm.
  • Compact and sleek design.
  • Certified and tested quality.
Main Highlights
  • Accurately alarms from 50 ppm of CO in the air
  • Electro-chemical CO sensor accurately detects the presence of Carbon Monoxide and emits a loud, clear alarm to alert residents
  • Suitable for installations in homes in England and Wales (not suitable for homes in Scotland under the new 2022 legislation)
  • Sleek & compact - dimensions (HxWxD): 61 x 96 x 38mm
  • Provides low battery warning when batteries require replacement
  • CE marked, and UKCA tested and certified
  • 3 Year Manufacturer’s Warranty
  • TUV Certified to EN 50291-1:2018
8.7
Excellent
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Related Deals You Might Like for Carbon Monoxide Alarm

📊We scanned 297 products
🔍
We reviewed the most relevant Carbon Monoxide Alarm offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Fireangel, Kidde, XINDUM, X-Sense, known for dependable quality and smart design.
⭐
To determine today's best Carbon Monoxide Alarm, we analysed 1486 real customer and expert reviews, focusing on satisfaction, real-world performance and long-term reliability. We also weigh each review's relevance, authenticity and freshness for a fair comparison.

What we concluded:

🏆 #1
FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home w/Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor w/Test Button - 2-Pack

Our overall winner is FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home w/Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor w/Test Button - 2-Pack by Fireangel. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Alerts with flashing lights.
✓Test button ensures functionality.
✓Includes replaceable AA batteries
💎 Best Value
Twin Pack Kidde 5CO Battery Powered Carbon Monoxide Alarm and Detector - 10 Year Sensor Life with AA Batteries

The best value for most shoppers is Twin Pack Kidde 5CO Battery Powered Carbon Monoxide Alarm and Detector - 10 Year Sensor Life with AA Batteries by Kidde, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
Carbon Monoxide Detector with LCD Digital Display, CE Certified CO Alarm with Sealed in 10 Year Battery, Standalone Audible CO Detector for Home,White,1 Pack

The strongest deal right now for Carbon Monoxide Alarm is Carbon Monoxide Detector with LCD Digital Display, CE Certified CO Alarm with Sealed in 10 Year Battery, Standalone Audible CO Detector for Home,White,1 Pack at XINDUM, currently at 42% off.

🔄Our Carbon Monoxide Alarm ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.