The First Alert® tamperproof alarm is powered by a 10-year sealed lithium power cell. No need to replace batteries for the life of the alarm. The sealed battery and tamper proof design of this alarm meet code regulations where required. Mute feature silences nuisance alarms from cooking smoke or shower steam. Single button also tests alarm functions, easy access battery drawer: no need to remove alarm from ceiling to change battery. 10-year limited warranty.
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