First Alert CO400B Carbon Monoxide Detectors, White Strike Plates Designed for die-cut or a

Designed for die-cut or a half sheet of standard sandpaper

and color retention

non-ferrous metals

Highly concentrated and low foam

First Alert CO400B Carbon Monoxide Detectors, White Strike Plates Designed for die-cut or aWorks during power outages. No installation required. Place or mount almost anywhere. Mute test button to quiet unnecessary alarms, test alarm function. 85 decibel alarm, low battery warning. Low battery mute quiets low battery signal for up to 8 hours. Front open compartment allows battery change without taking alarm down. Electrochemical sensor is the most accurate technology available for detecting carbon monoxide. End of life timer alarm chirps