Will My Alarm System Work if My Electric is Out?
In the event of a power outage, HEYI alarm system will sustain itself with a back-up battery for up to at least 8 hours after the AC power fails. The battery is usually drained if the home security panel is not receiving electricity. After AC power is restored, the battery will recharge itself. Besides, the alarm panel will report to users when AC power off/ reactivated.
Therefore, please rest assured that the alarm system will work well if the electric is out.