First Alert CO400B Carbon Monoxide Detector, 2AA Battery Powered

by First Alert
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About the First Alert Carbon Monoxide Detector - CO400B 2AA Battery Powered Carbon Monoxide Alarm

The First Alert CO400B is a battery-powered carbon monoxide alarm that is designed around the main attraction to be portable. You can install the portable device anywhere in your home because it has no cords, meaning it does not need to be plugged in.

The compact design of the First Alert Carbon Monoxide Detector CO400B allows you to easily hide the detector in any room and any location without it being an eye sore. When the device is hidden, it runs on batteries and protects you from hazardous carbon monoxide. This system also contains a test and silence button so you can always easily test the device to make sure it is working properly.

The First Alert CO400B is a simple yet effective device that can save you from the hidden dangers of carbon monoxide. The slim design allows you to hide the device anywhere. Every home needs a reliable carbon monoxide detector, so pick yours up today!


  • Battery Powered Works even during Power Outages
  • Integrated Test/Silence Button


  • Detector Type: Carbon Monoxide
  • Sensor Type: Electrochemical
  • Power Source: Battery Powered
  • Temperature Range: 40°F to 100°F
  • Humidity Range: 10% to 90% Relative Humidity
  • Certifications: UL listed


5 years through the manufacturer.

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