First Alert Battery Operated CO Detector


The First Alert CO400 Carbon Monoxide Alarm is designed to detect carbon monoxide. This wireless carbon monoxide detector is ideal for spaces without electricity or those that lose power frequently. The personal carbon monoxide detector features a loud 85-decibel siren, indicator lights that warn when batteries are low, and an end-of-life timer that lets you know when it is time to replace the device.

What’s in the Box:

  • First Alert CO400 Carbon Monoxide Alarm
  • 9-volt battery
  • Owner’s manual


  • CO detector alerts you to carbon monoxide
  • Electrochemical CO sensor detects carbon monoxide
  • Battery-operated design works almost anywhere
  • Loud 85-decibel alarm sounds when CO levels are elevated
  • Single test/silence button for simple operation
  • Battery-operated carbon monoxide alarm
  • Uses electrochemical carbon monoxide sensor–the most accurate technology available
  • Simple to use silence/test button, low battery warning, end-of-life timer
  • 1-9V Battery or 2-AA Battery (included) power source.
  • 5 year limited warranty

One CO alarm, user’s manual, and one 9-volt battery

Additional information

Weight 2 lbs
Dimensions 10 × 10 × 2 in


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