First Alert Battery Operated Carbon Monoxide Alarm - 6 pk

  • Alerts you to CO threats
  • Simple and easy to use
  • Battery-operated detector works almost anywhere
Availability: In stock


The First Alert CO400 Carbon Monoxide Alarm utilizes an electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. This carbon monoxide detector is battery operated, making it portable and easy to use, even in the event of a power outage. When carbon monoxide levels become elevated, a loud 85-decibel alarm alerts you to the threat.

  • CO detector alerts you to carbon monoxide
  • Battery-operated detector works almost anywhere
  • Loud 85dB alarm sounds when CO levels are detected
  • Detector features a single test/silence button for efficient testing
  • Mute button, mutes unnecessary alarms. also tests alarm function with same button
  • Low battery signal mute, quiets low battery signal for up to 8 hours.
  • Electrochemical sensor, most accurate technology available for detecting carbon monoxide compared to other common sensing technologies
  • End of life timer, alarm chirps when it is time to replace it
  • 9V battery included
  • Emits T3 pattern
Alerts You to CO Threats

The First Alert battery-operated carbon monoxide alarm uses an advanced electrochemical CO sensor to detect elevated carbon monoxide levels. When CO is detected, the carbon monoxide detector sounds an alarm to warn you of the threat.

Warning Features

When carbon monoxide levels are detected, the First Alert carbon monoxide detector sounds an 85-decibel siren . A low-battery light and alarm alert you when battery power is running low, and an end-of-life warning lets you know when the detector should be replaced.

Simple and Easy to Use

The First Alert Carbon Monoxide Alarm is easy to set up. Simply insert the battery, and the CO detector will start to monitor your space for carbon monoxide. There are no complicated displays or settings to navigate–a single button silences the alarm and tests the battery-operated CO detector.

Where To Place Carbon Monoxide Alarms

One on every level of the home and one in each sleeping area.

  • Battery Type: 9V
  • Sensor Type: Electrochemical
  • Length: 3-3/8"
  • Width: 1-1/2"
  • Height: 5"
  • Weight: 0.7 lb
  • Warranty: 7 Year Limited
  • Package: 6 pk

Instruction Manual.pdf


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