Sealed-In Lithium Battery – Sealed-in lithium power supply; no battery replacement required over the 10 year life of the alarm. Eliminates worry about battery removal or unauthorized deactivation of alarm.
Self Activation – Alarm automatically activates when attached to the mounting bracket.
Alarm Memory – Rapidly flashing LED alerts user if the alarm has sounded since the last time the test/reset button was used.
Hush^TM – Will temporarily silence nuisance alarms and will not allow hush mode to be activated unless the unit is in alarm mode.
Test/Reset Button – Tests unit’s circuit operation and resets memory after an alarm condition occurs.
End of Life Warning – Alarm chirps every 40-45 seconds indicating the alarm is in need of replacement.
Tamper Resist – (when activated upon installation) effective in preventing someone from removing the unit from the mounting bracket.
LED – A flashing red indicator light with four modes of operation: standby, alarm mode, hush mode, and memory set.

Kidde Sealed Lithium Battery Power Smoke Alarm