Best Smart Carbon Monoxide Detector of 2026

Last updated on 03/04/2026
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Best Choice
1
9.8
Exceptional
X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 2-Pack
X-Sense

X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 2-Pack

Why we love it
  • Dual protection for safety.
  • Talking alarm for emergencies.
  • Long-lasting 10-year lifespan.
Main Highlights
  • Attention: The Smart Combination Smoke and Carbon Monoxide Alarm XP0A-iR connects to the app over Wi-Fi without a base station; XP0A-iR devices are not interlinked and operate independently
  • Talking Alarm Says the Location: Quickly and accurately react to the danger thanks to this smoke and carbon monoxide alarm which announces the location of the emergency: ‘Warning! Smoke detected in Living Room. Evacuate.’ and ‘Warning! Carbon monoxide detected in Master Bedroom. Move to fresh air.’
  • Dual Protection: Keep your family safe from both smoke and carbon monoxide with a photoelectric smoke sensor and an electrochemical CO sensor in a single device; peace of mind comes in one alarm
  • Stay Informed: Get app updates on the alarm, such as low battery, silence mode, test mode and Wi-Fi connection, so you always know what’s going on and that you are being kept safe
  • Share with Family: Share devices with up to 12 family members using the X-Sense Home Security App; authorized users can receive alerts, view the alarm history, and remotely silence the device, giving everyone control of their home safety anytime, anywhere
  • Ultra-Slim Design, Loud Alarm: The simple and elegant design of this smoke and carbon monoxide alarm blends seamlessly into your home decor and its dual function saves you from having two devices; the 85 dB alarm ensures you can hear it wherever you are in the house
  • 10-Year Service Life: Protect your family for up to a decade with a single alarm made to be durable with flame-retardant ABS material and long-lasting sensors
9.8
Exceptional
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Best Value
2
9.6
Superb
Save 19%
X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm with Replaceable Battery, Smart Combination Detector Compatible with X-Sense Home Security App, SC06-WX, 2-Pack
X-Sense

X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm with Replaceable Battery, Smart Combination Detector Compatible with X-Sense Home Security App, SC06-WX, 2-Pack

19% Off
Why we love it
  • Dual threat home protection.
  • Remote monitoring through app.
  • Instantly silences via app.
Main Highlights
  • 2-in-1 Protection: Keep your home safe from both fires and carbon monoxide with a single alarm featuring both photoelectric and electrochemical CO sensors; these sensors operate independently to instantly alert you to hazardous smoke or CO levels, making it simple to protect your family from two deadly threats at once
  • Wi-Fi Connection: Manage this battery-operated smoke and CO alarm directly via the X-Sense Home Security app over 2.4 GHz Wi-Fi, with no base station needed
  • Tap in the App to Silence: Use the app to instantly silence the alarm without the hassle of trying to reach the test/silence button on the smart combination detector
  • Get Alerts Anywhere: Monitor your home remotely and receive immediate app notifications in the case of alarms, low battery, faults or more, giving you extra confidence when you leave the house
  • Device Sharing: Share your smoke and CO detector with up to 12 other users through the X-Sense Home Security app so family, friends and neighbors can get alerts too
  • Precautionary CO Alert: Get an early warning if CO levels exceed 100 ppm, allowing you to take action before a critical situation occurs
9.6
Superb
Save 19%
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3
9.5
Superb
Save 15%
X-Sense Wi-Fi Combination Smoke Alarm and Carbon Monoxide Alarm with Replaceable Battery, Smart Fire Alarm Compatible with X-Sense Home Security App, SC07-WX, 2-Pack
X-Sense

X-Sense Wi-Fi Combination Smoke Alarm and Carbon Monoxide Alarm with Replaceable Battery, Smart Fire Alarm Compatible with X-Sense Home Security App, SC07-WX, 2-Pack

15% Off
Why we love it
  • Precise, fast danger detection.
  • Share safety with family.
  • Instant app notifications.
Main Highlights
  • Attention: The SC07-WX Wi-Fi Smoke and Carbon Monoxide Alarm is not compatible with SBS50 base station and does not support interconnect function
  • Decade-Long Safety with Precision Detection: This smoke and carbon monoxide alarm combines photoelectric smoke and Figaro electrochemical CO sensors, ensuring fast and accurate detection and a 10-year lifespan, giving you the utmost safety and peace of mind
  • Device Sharing: With the X-Sense Home Security app, you can effortlessly share your devices with 12 family and friends, enabling them to monitor your home safety and receive crucial alerts
  • CO Alarm Precaution: You’ll receive an immediate warning on the app when the CO level exceeds 100 ppm from your carbon monoxide and smoke detector, enabling you to respond promptly without waiting for a delayed response
  • CO Detection History at Your Fingertips: Access your home's CO concentration history from anywhere using the app; stay informed about your home's safety with comprehensive CO detection data
  • Direct 2.4 GHz Wi-Fi Connection: The battery-powered smoke and carbon monoxide alarm connects directly to the X-Sense Home Security app via the 2.4 GHz Wi-Fi network, no base station required
  • Stay in the Know with Instant Alerts: Keep an eye on your home from anywhere and get immediate push notifications through the X-Sense Home Security app for alarms, low battery, faults, and more
9.5
Superb
Save 15%
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4
9.3
Superb
Save 7%
Netatmo UK NCO-UK Smart Carbon Monoxide Alarm, White
Netatmo

Netatmo UK NCO-UK Smart Carbon Monoxide Alarm, White

7% Off
Why we love it
  • Real-time carbon monoxide monitoring.
  • Smartphone notifications for alerts.
  • Long-lasting 10-year battery.
Main Highlights
  • Monitors the carbon monoxide levels emitted by your fuel-burning appliances (boiler, fireplace, etc.) in real time.
  • 85-decibel alarm plus notification via your smartphone if carbon monoxide is detected in your home.
  • The 10-year* battery lasts the entire lifetime of the Carbon Monoxide Alarm.
  • The Self-Test feature checks the Carbon Monoxide Alarm is functioning correctly and alerts you if necessary.
  • Your Smart Carbon Monoxide Alarm is standalone, so you don’t need to buy a smart home hub.
9.3
Superb
Save 7%
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5
9.2
Superb
Save 14%
X-Sense Wi-Fi Combination Smoke Alarm and Carbon Monoxide Alarm with Replaceable Battery, Smart Fire Alarm Compatible with X-Sense Home Security App, SC07-WX, 1-Pack
X-Sense

X-Sense Wi-Fi Combination Smoke Alarm and Carbon Monoxide Alarm with Replaceable Battery, Smart Fire Alarm Compatible with X-Sense Home Security App, SC07-WX, 1-Pack

14% Off
Why we love it
  • Reliable detection for utmost safety.
  • Effortless device sharing feature.
  • Instant alerts for added security.
Main Highlights
  • Attention: The SC07-WX Wi-Fi Smoke and Carbon Monoxide Alarm is not compatible with SBS50 base station and does not support interconnect function
  • Decade-Long Safety with Precision Detection: This smoke and carbon monoxide alarm combines photoelectric smoke and Figaro electrochemical CO sensors, ensuring fast and accurate detection and a 10-year lifespan, giving you the utmost safety and peace of mind
  • Device Sharing: With the X-Sense Home Security app, you can effortlessly share your devices with 12 family and friends, enabling them to monitor your home safety and receive crucial alerts
  • CO Alarm Precaution: You’ll receive an immediate warning on the app when the CO level exceeds 100 ppm from your carbon monoxide and smoke detector, enabling you to respond promptly without waiting for a delayed response
  • CO Detection History at Your Fingertips: Access your home's CO concentration history from anywhere using the app; stay informed about your home's safety with comprehensive CO detection data
  • Direct 2.4 GHz Wi-Fi Connection: The battery-powered smoke and carbon monoxide alarm connects directly to the X-Sense Home Security app via the 2.4 GHz Wi-Fi network, no base station required
  • Stay in the Know with Instant Alerts: Keep an eye on your home from anywhere and get immediate push notifications through the X-Sense Home Security app for alarms, low battery, faults, and more
9.2
Superb
Save 14%
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6
9.0
Superb
Save 15%
Heiman Smart Matter Carbon Monoxide Detector (Hub Required) - CO Detector for SmartThings & Home Assistant, Certified to 50291, Replaceable Batteries, Sensor 10 Years, 85dB, HS-725ES-M
HEIMAN

Heiman Smart Matter Carbon Monoxide Detector (Hub Required) - CO Detector for SmartThings & Home Assistant, Certified to 50291, Replaceable Batteries, Sensor 10 Years, 85dB, HS-725ES-M

15% Off
Why we love it
  • Smart alerts via app.
  • Ten year sensor life.
  • Loud 85dB alert.
Main Highlights
  • Connectivity Matter & Home Automation: Enjoy remote alerts via app and home automation. This smart carbon monoxide detector is currently only compatible with SmartThings and Home Assistant. A Matter compatible Thread (Hub) border router is imperative to use these functions
  • Safety certified: Certified according to EN 50291:2018, UKCA and RoHS. The device accurately monitors the air and alerts you immediately as soon as a dangerous CO concentration is detected, preventing any risk of poisoning.
  • 10 years life and sensor: Thanks to its precise electrochemical sensor, this CO detector offers 10 years of protection. It runs on replaceable AA batteries (5 years of battery life), making it more durable and economical than disposable models.
  • Compact for home and camping: With its dimensions of 85 x 85 mm, it is very discreet. Thanks to its wireless operation, this carbon monoxide detector is also ideal for camping and caravans, ensuring you reliable protection even when travelling.
  • Dual Alert & 85dB: Double security with a powerful 85dB siren and instant push notification in case of critical CO concentration. The large test button allows you to check the operation or easily mute false alarms.
9.0
Superb
Save 15%
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7
8.8
Excellent
Save 27%
X-Sense Smart Wi-Fi Carbon Monoxide Detector, with Temperature & Humidity Monitor, Voice Alert, Replaceable Battery, Digital Display and Historic CO Peak Level, XC0M-iR 1-Pack
X-Sense

X-Sense Smart Wi-Fi Carbon Monoxide Detector, with Temperature & Humidity Monitor, Voice Alert, Replaceable Battery, Digital Display and Historic CO Peak Level, XC0M-iR 1-Pack

27% Off
Why we love it
  • Remote monitoring via app.
  • Multiple users receive alerts.
  • Triple sensor monitoring.
Main Highlights
  • Note: XC0M-iR is only compatible with 2.4 GHz Wi-Fi; not support the base station wireless interconnection; this CO alarm cannot interconnect with other alarms, working independently
  • Remote Control via App: Connect to the X-Sense Home Security app to access historical temperature and humidity data (hourly/daily/weekly/monthly/yearly), even while far away from home; simply scroll on your phone to check the status of the CO alarm
  • Multi-User Sharing: Easily add multiple users to share device information; whether you're at work or on vacation, shared users will receive real-time alerts for potential dangers, fault notifications, and so on
  • 3-in-1 Precise Monitoring: CO concentration, temperature, and humidity monitoring are integrated into one alarm, offering you multi-dimensional and more precise monitoring; these data are automatically scrolling every 10 seconds
  • Location-Speaking Alerts: This CO alarm supports three language options: English, German, and French, so you can choose the one you prefer; clearly tells you where the danger is, allowing even children to understand instantly and move to safety
  • Flexible Placement: Designed with freestanding feet, you can put it on flat surfaces stably; it also supports mounting on the wall with included tools; ideal for multiple spaces, like bedroom, kitchen, and living room
  • Smart Night Mode: With a built-in night mode feature, you can set a silence time duration via the app, providing you a safe but peaceful sleep; not only safeguards every breath you take in, but also ensures you have a nice sleep
  • Physical Button Design: Featured with a Peak Level button to check past CO highs, this smart CO alarm helps you catch potential dangers early; double-press to change temperature units; easy for anyone to use
  • Long-Term Reliable Protection: Integrated with advanced technology, the built-in sensor lasts up to 10 years; the last alarm you buy for the next decade, providing you and your family a 10-year lasting protection
  • Dedicated Supportive Hotline: X-SENSE always puts the demands of customers on priority; with the professional team, we’re here 24/7 to answer your call; please contact us with confidence
8.8
Excellent
Save 27%
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8
8.7
Excellent
Save 7%
WiFi Smart Carbon Monoxide & Natural Gas Detector, 2 in 1，Plug-in, CO Gas Leak Alarm for Natural Gas, LPG, Methane, Propane & Butane, App Monitoring & LED Display， EN50291 & EN50194 Certified
tulilut

WiFi Smart Carbon Monoxide & Natural Gas Detector, 2 in 1，Plug-in, CO Gas Leak Alarm for Natural Gas, LPG, Methane, Propane & Butane, App Monitoring & LED Display， EN50291 & EN50194 Certified

7% Off
Why we love it
  • Dual gas and CO detection.
  • Real-time alerts on smartphone.
  • Easy plug-in installation design.
Main Highlights
  • 【 2-IN-1 GAS & CO PROTECTION】 Detects both combustible gases (Natural Gas, LPG, Methane, Propane, Butane) and carbon monoxide in one single device. Provides full protection against two of the most common household hazards.
  • 【 REAL-TIME MONITORING VIA APP】 Connects to 2.4GHz WiFi and the Tuya Smart/Smart Life app. Receive instant smartphone alerts in case of gas leaks or increased CO levels, review history data, mute the alarm, or adjust volume remotely.
  • 【 COLOUR LED DISPLAY】 Bright colour LED screen shows real-time gas and CO concentration (ppm) levels for immediate awareness. Auto-dimming mode ensures comfortable visibility day and night.
  • 【 PLUG-IN DESIGN, NO BATTERIES NEEDED】 Simply plug into a standard wall socket—no wiring or battery replacement required. Made from high-quality, flame-retardant materials for enhanced durability and safety.
  • 【 EN50291 & EN50194 CERTIFIED SAFETY】 Tested and certified according to strict European standards for gas and carbon monoxide detection. Ensures accurate readings, reliable alerts, and peace of mind for your home safety.
  • 【 FLEXIBLE INSTALLATION & 24H SUPPORT】 Ideal for kitchen, basement, garage, or motorhome. Mount 0.3–1m below the ceiling for lighter gases (CO, Methane) or 0.3–1m above the floor for heavier gases (LPG, Propane, Butane). Includes English manual and 24-hour customer support.
8.7
Excellent
Save 7%
Amazon Logo
9
8.7
Excellent
Save 15%
X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 1-Pack
X-Sense

X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 1-Pack

15% Off
Why we love it
  • Talking alarm announces emergencies.
  • Dual smoke, CO protection.
  • Share devices with family.
Main Highlights
  • Attention: The Smart Combination Smoke and Carbon Monoxide Alarm XP0A-iR connects to the app over Wi-Fi without a base station; XP0A-iR devices are not interlinked and operate independently
  • Talking Alarm Says the Location: Quickly and accurately react to the danger thanks to this smoke and carbon monoxide alarm which announces the location of the emergency: ‘Warning! Smoke detected in Living Room. Evacuate.’ and ‘Warning! Carbon monoxide detected in Master Bedroom. Move to fresh air.’
  • Dual Protection: Keep your family safe from both smoke and carbon monoxide with a photoelectric smoke sensor and an electrochemical CO sensor in a single device; peace of mind comes in one alarm
  • Stay Informed: Get app updates on the alarm, such as low battery, silence mode, test mode and Wi-Fi connection, so you always know what’s going on and that you are being kept safe
  • Share with Family: Share devices with up to 12 family members at no additional cost using the X-Sense Home Security App; authorized users can receive alerts, view the alarm history, and remotely silence the device, giving everyone control of their home safety anytime, anywhere
  • Ultra-Slim Design, Loud Alarm: The simple and elegant design of this smoke and carbon monoxide alarm blends seamlessly into your home decor and its dual function saves you from having two devices; the 85 dB alarm ensures you can hear it wherever you are in the house
  • 10-Year Service Life: Protect your family for up to a decade with a single alarm made to be durable with flame-retardant ABS material and long-lasting sensors
8.7
Excellent
Save 15%
Amazon Logo
10
8.7
Excellent
Save 20%
X-Sense Wi-Fi Smart Carbon Monoxide Alarm Carbon Monoxide Detector, Real-Time Push Notifications via X-Sense Home Security App, Replaceable Battery, Free-Standing Design, XC04-WX
X-Sense

X-Sense Wi-Fi Smart Carbon Monoxide Alarm Carbon Monoxide Detector, Real-Time Push Notifications via X-Sense Home Security App, Replaceable Battery, Free-Standing Design, XC04-WX

20% Off
Why we love it
  • 10-year battery life.
  • Instant CO level alerts.
  • Real-time monitoring app.
Main Highlights
  • Attention: XC04-WX Wi-Fi Carbon Monoxide Detector is not compatible with SBS50 base station and does not support interconnect function
  • 2.4 GHz Wi-Fi Connection: Easily connect this alarm to the X-Sense Home Security app on your smartphone via a 2.4 GHz Wi-Fi network, without the need for a hub; download the app, sign up, and connect the device
  • 10-Year Sensor Life: This battery-operated smart carbon monoxide detector has a stable and high-performance electrochemical Figaro CO sensor that accurately monitors CO levels in the house, ensuring that your family stays protected for 10 years
  • Instant Notifications: Stay connected to your alarm and view all its notifications, including its CO alarm, low battery, malfunction, CO alarm precaution, and more; the Device Sharing function lets you add your family members so you can all keep an eye on your home's safety
  • Real-Time CO Levels & One Button to Silence: When a CO alarm is triggered, the app will show real-time CO level changes; after making sure your surroundings are safe, you can simply silence the alarm via the app
  • CO Alarm Precaution: Using the app, you will quickly receive a warning that alerts you to any possible risk once the CO level reaches above 100 ppm without waiting for the response time, allowing you to act immediately
8.7
Excellent
Save 20%
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📊We scanned 984 products
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We reviewed the most relevant Smart Carbon Monoxide Detector offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like X-Sense, Netatmo, HEIMAN, tulilut, known for dependable quality and smart design.
⭐
To determine today's best Smart Carbon Monoxide Detector, we analysed 4921 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
X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 2-Pack

Our overall winner is X-Sense Wi-Fi Combination Smoke and Carbon Monoxide Alarm with English Voice Alerts, Smart Smoke Alarm for Home with Replaceable Battery, XP0A-iR, 2-Pack by X-Sense. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Dual protection for safety
✓Talking alarm for emergencies
✓Long-lasting 10-year lifespan
💎 Best Value
X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm with Replaceable Battery, Smart Combination Detector Compatible with X-Sense Home Security App, SC06-WX, 2-Pack

The best value for most shoppers is X-Sense Wi-Fi Smoke and Carbon Monoxide Alarm with Replaceable Battery, Smart Combination Detector Compatible with X-Sense Home Security App, SC06-WX, 2-Pack by X-Sense, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
X-Sense Smart Wi-Fi Carbon Monoxide Detector, with Temperature & Humidity Monitor, Voice Alert, Replaceable Battery, Digital Display and Historic CO Peak Level, XC0M-iR 1-Pack

The strongest deal right now for Smart Carbon Monoxide Detector is X-Sense Smart Wi-Fi Carbon Monoxide Detector, with Temperature & Humidity Monitor, Voice Alert, Replaceable Battery, Digital Display and Historic CO Peak Level, XC0M-iR 1-Pack at X-Sense, currently at 27% off.

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