The First Alert CO400 carbon monoxide alarm utilizes a electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. This carbon monoxide detector is battery powered, making it portable and easy-to-use anywhere, even in the event of a power outage. When carbon monoxide levels become elevated, a loud 85 dB alarm alerts you to the threat.
| Alarm Type | Audible |
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| Dimensions | 3.4 in L x 1.5 in W x 5 in H |
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| Includes | Battery |
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| Power Source | Battery |
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| Sensor Type | Electrochemical |
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| Sound Level | 85 dB |
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