10-Year Sealed Lithium Battery Eliminates the need to replace the battery. No battery to replace for the life of the alarm (10 years).
Test/Reset Button Tests the unit for proper operation. Resets the carbon monoxide alarm.
End of Life Notification Ten (10) years after unit is first powered, this alarm will emit two beeps every 30 seconds to indicate it is time to replace the alarm.
Event Memory Red LED flashes every 60 seconds to alert that a high level of carbon monoxide has been detected within the last 14 days.