First Alert CO400 Battery Powered Carbon Monoxide Alarm

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First Alert Battery-Powered Carbon Monoxide Alarm

The First Alert CO400 Carbon Monoxide Alarm utilizes a electrochemical carbon monoxide sensor that lasts for up to 5 years to detect carbon monoxide. This carbon monoxide detector is battery powered, making it portable and easy to use anywhere. When carbon monoxide levels become elevated, a loud 85dB alarm alerts you to the threat.


  • Model number C0400
  • Alerts to dangerous carbon monoxide levels
  • Most accurate electrochemical carbon monoxide sensor technology
  • Battery-operated design works almost anywhere
  • Loud 85dB alarm sounds when carbon monoxide levels are elevated
  • Single test/silence button for simple operation
  • 5-year limited warranty
  • Includes 9V battery

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