QWORK Power Failure Alarm, 118 db Loud Siren with LED Light, 110V to 220V, Off/On Alert

Function: Alarm for both power failure and come back, different alarm voice for power off and on. 118 dB: 118 db loud siren that keeps the alarm until it is turned off or the battery is exhausted. LED Light: Led flashing allow you to see the alert even from far away. Only flashing when power off. Manual Control: You can manually turn off the alarm after you get alert. Powered by 1 unit 9V battery (not include), Working voltage: 110-220V. Easy to Use: No wiring needs, just plug in the power outlet, turn on the switch, the alarm can start to work.