Carbon monoxide (CO) is an odorless, invisible, and extremely dangerous gas, which can be given off by the most common appliances in your home or even a car in an attached garage. The good news is that First Alert offers protection and prevention through our selection of carbon monoxide alarms. We provide our carbon monoxide detector technology because we want to help protect what matters most to you!


Battery (DC) - Battery Powered Carbon Monoxide Alarm

Model Number: CO400

Model Number: CO400

Battery Powered: Works during power outages.
Silence/test button: Silence or test alarm functions.
No installation required: Place or mount almost anywhere.
Alarm Action Chart: Instructs for what to do if an alarm sounds.

Additional Features:

  • Loud 85 - decibel alarm
  • Low battery warning
  • AA batteries included
  • UL listed
  • 5 year limited warranty
provides consistent protection for added safety during power outages battery backup
mutes unnecessary alarms immediately. also tests alarm function with same button mute button
  Alarm sounds
  Low Battery sound
  Supervisory Chirp
  Power up indication
  Malfunction Sound for Products Manufactured Prior to 8/1/09