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This long life battery operated smoke alarm uses a lithium battery that is warranted to last 10 years. The photoelectric smoke sensing technology reduces nuisance alarms from cooking smoke and shower steam. 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.Meets UL standards.
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