CO400 Battery Operated Carbon Monoxide Alarm

SKU: CO400

CO400 Battery Operated Carbon Monoxide Alarm

SKU: CO400


The First Alert® CO400 Battery-Operated Carbon Monoxide Alarm utilizes an electrochemical carbon monoxide sensor 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.

  • Detector features a single test/silence button for efficient testing
  • Battery-operated detector is portable
  • Loud 85-decibel alarm sounds when CO levels are detected
  • CO detector alerts you to carbon monoxide
Product Overview


Alerts You to CO Threats

The First Alert CO400 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 alarm. 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 CO400 Battery-Operated Carbon Monoxide Detector 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 this product. A single button silences the alarm and tests the CO detector operated by batteries.

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Getting Started

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Product Manuals

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User Manual for CO400 Carbon Monoxide Alarm (English, Spanish)