Keep your family safe without the hassle of battery-replacement and maintenance. The sealed-in battery keeps this carbon monoxide alarm functioning for ten years without the need for replacement. Easy to install alarm automatically activates when attached to the mounting bracket. Test/reset button tests unit for proper operation and resets carbon monoxide alarm. Green LED flashes every 30 seconds, indicating unit is operating properly. Red LED will pulse and a loud alarm pattern will sound when a dangerous level of carbon monoxide is detected. Red LED will also flash every 60 seconds if a high level of carbon monoxide has been detected within 14 days. Power Source(s): Lithium-Ion Battery; Mounting: Wall.

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