Front-access battery compartment, allows easy battery replacementSingle Button Test/SilenceTwo silence features, can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarmEnd of Life Signal provides audible notification alarms needs to be replaced
10-Year Battery 2-In-1 Smoke and CO Alarm, 10-Year Sealed Battery, for continuous protection. No battery replacements required for the life of the alarm