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Better protect your family, even from a distance, with the Smart Carbon Monoxide Alarm

Simply detect an odourless and invisible hazard

Your Alarm continuously measures carbon monoxide levels, an odourless gas that can be deadly. It warns you in real-time if the risk threshold is crossed. It alerts those present with its 85-decibel alarm and simultaneously warns you on your smartphone so that you can immediately warn your family and the emergency services.

Enjoy 10 years of peace of mind

The Carbon Monoxide Alarm comes with a battery that lasts 10 years*, which is the maximum lifespan of any CO detector.
That means you don’t need to change any batteries because when you receive a low-battery alert, you’ll know it’s time to replace your Alarm.

*Life span for typical use. The battery’s life span may vary based on the use of the Smart Carbon Monoxide Alarm. For further information, please go to

The Alarm performs its own diagnostic checks

With the auto-test feature, your Alarm checks the status of its battery, sensor, and Wi-Fi connection, sending you a notification in case of any issues.

No extra fees

The Carbon Monoxide Alarm is a standalone product and works without any additional equipment. It offers the best protection for you and your family, subscription-free.

This product is not available in your country.

The Carbon Monoxide Alarm that blends in with your home’s decor

It detects what you can’t see, without even being noticed

Our Smart Carbon Monoxide Alarm is compatible with Apple Home and Google Home

Hey Siri, what’s the level of carbon monoxide in the home?

Quick and easy installation

Your Smart Alarm is battery-powered and easy to install. Place one in each room where there is a fuel-burning appliance (boiler, fireplace, gas cooker, etc.).

Discover our app

Create an ecosystem tailored to your needs. Access all your Netatmo security products and their features in the Home + Security app, with no subscription fees or any extra costs.

App available on App Store / Play Store.

Technology at the heart of the product

  • Interoperability
    • Do you have a Netatmo Smart Thermostat for your gas, oil or wood boiler? With Apple HomeKit compatibility, you can create a scene so that your Netatmo Thermostat shuts off the boiler whenever the alarm detects carbon monoxide.
  • Dimensions
    • 100x100x23 mm
  • Specifications
    • Smart Carbon Monoxide Alarm: Be alerted wherever you are when carbon monoxide is detected in your home
    • Electrochemical carbon monoxide detection sensor
    • Alarm volume85 dB
  • Connectivity
    • Wi-Fi 802.11 b/g/n (2.4 GHz)
    • Open/WEP/WPA/WPA2-personal (TKIP and AES)
    • Bluetooth Low Energy (BLE)
  • Free app, for life
    • Subscription-free
    • App available on App Store / Play Store.
  • App compatibility
    • iPhone and iPad compatibility:To use this HomeKit-enabled accessory, we recommend using the latest version of iOS or iPadOS.
    • Android compatibility:A recent version of Android with access to Play Store is recommended.
    • Supported browsersWeb app available for the latest two versions of: Chrome, Safari, Firefox, Internet Explorer.
    • Note:
    • The remote alarm test function is not available on the webapp.
  • System requirements
    • Wireless high-speed internet access. Hotspots are not supported
    • Note:
    • The Smart Carbon Monoxide Alarm will detect carbon monoxide and sound its alarm even if it’s not connected to the Wi-Fi. However, Wi-Fi is required to receive smartphone alerts from the Carbon Monoxide Alarm.
  • Power and batteries
    • Built-in 10-year battery*
  • Pack contents
    • 1 Smart Carbon Monoxide Alarm
    • 1 wall mounting bracket
    • 2 screws and 2 anchors
    • 1 user guide
  • Regulatory declarations
Materials and technologies
  • Technologies
    • 85-decibel alarmDon't be afraid; with its 85-decibel alarm, the alarm will alert you and your family if there’s smoke.
    • 10 years’ peace of mindThe Carbon Monoxide Alarm has a 10-year lifespan.The built-in battery gives you 10 years of peace of mind because you don’t need to change your Carbon Monoxide Alarm’s batteries.
    • Remote alertsWith the app, you will be alerted in real-time if a fire breaks out in your home while you’re out.
  • Materials
    • Made to lastA minimalist and timeless design made of durable, resistant white plastic.


What is carbon monoxide and where does it come from?

Carbon monoxide (CO) is a colourless, odourless, tasteless, and potentially deadly toxic gas. It comes from the incomplete combustion of fuels such as wood, butane, coal, petrol, oil, natural gas, petroleum and propane. It prevents the blood's ability to transport oxygen. For your safety, it is recommended to install carbon monoxide detectors to measure carbon monoxide levels.

What are the effects of exposure to carbon monoxide?

It depends on the level of exposure to carbon monoxide:
  • 100 ppm = Mild exposure. Mild headaches, nausea, vomiting, fatigue, flu-like symptoms.
  • 200 ppm = Medium exposure. Throbbing headaches, drowsiness, confusion, rapid heart rate.
  • 400 ppm = High exposure. Dizziness, nausea, visual impairment, muscular weakness. Risk of death after 3 hours of exposure.
  • 800 ppm = Extreme exposure. Convulsions, loss of consciousness, brain damage, heart and lung failure followed by death. Risk of death after 2 hours of exposure."

How many Netatmo Smart Carbon Monoxide Alarms can I install in the app?

You can install an unlimited number of Netatmo Smart Carbon Monoxide Alarms in the Home + Security app.

Can I change the battery after 10 years?

The Smart Carbon Monoxide Alarm is a battery-powered device. The battery is built in. It was designed to cover the entire lifespan of the detector. For safety reasons and to guarantee maximum efficiency, all carbon monoxide detectors must be replaced after 10 years because the carbon monoxide detection sensor wears out over time.

A few weeks before the battery runs out, the product's fault LED will start to flash orange every minute and the alarm will beep twice every minute. Your detector will also send a low-battery alert to your smartphone.