Kidde 10 year Smoke Alarm with Hush FeatureKidde 10 year Smoke Alarm with Hush Feature Compact and simple smoke alarm with a non replaceable, sealed in Lithium battery for 10 years of continuous protection meaning the user never needs to change the battery for the full duration of the alarms life. KEY FEATURES 10 year long life operation never need to change the battery Sealed in battery never needs to be replaced End of life notification alerts you after 10 years when its time to replace the