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First Alert 1039718 Carbon Monoxide Alarm, 85 dB, Alarm: Audio, Electrochemical Sensor, White dog-food--07-09-26 PVC outer jacket resists waterAbout This Product 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. Highlights The most accurate CO sensor available