Mains Power Failure Alert 1 Our mains power failure alert is designed to help protect stock & equipment in the event of a mains power failure. It will activate a 40 decibel built in buzzer immediately informing you of the potential problem. It is very easy and fast to install. The buzzer will immediately activate during a power cut and stop once the power has been reinstated. The buzzer would operate for approximately 12 hours from a fully charged battery. The system can be either wall or desk mounted. Kit Includes: 1 x 3-pin Plug in Transformer 1 x Mains Power Failure Alert System 1 x PP3 Battery Specifications: Size: 112 x 60 x 67 mm Buzzer: 40 Decibel Transformer Input 220 - 240 v AC Transformer Output: 12v DC Transformer Type: 3 pin Battery: 1 x 9v PP3 Mounting Method: Wall or Desk