First Alert CO400 Carbon Monoxide Detector, Battery Operated Door Hardware The double lever arm can

The double lever arm can be installed for a regular or a top-of-jamb mount

Features a large storage tray for seals and other strapping tools

or for a parallel arm mount with the included parallel arm shoe

Grade 1 certified & UL / cUL listed for use on fire rated doors and positive pressure fire test

convenient handle

First Alert CO400 Carbon Monoxide Detector, Battery Operated Door Hardware The double lever arm canKeep your family safe with this easy to use, battery operated carbon monoxide alarm; Battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room. The alarm sequence should last 5 6 seconds. If it does not alarm, make sure fresh batteries are correctly