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HOT! 120db Power Cut Failure Outage Automatic Alarm Warn Siren LED Indicator 100% Brand new and high quality Power out/ failure alarm with led indicator The siren alarms when the power supply is cut off until restore power The siren could be munual silenced by on/off switch With indicator indicates the power condition High voltage resistant design, works fine even when grid voltage exceeds bid Drawer cell cover design, can easily change the battery Using method: connect the alarm with 220V power, turn on the power switch Size: 10 x 5.3 x 2.5cm(approx) Cable Length: 55cm (approx) Alarm volume: 120db Power: 9V battery (not included) Voltage: AC 220V Color: White