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Compatibility: STS-3xx Series (Full List in Description)
Power Adapter Overview This 9-Volt power adapter has a built-in backup battery to protect against power outages, brownouts, and to help regulate the power to your alarm. This power adapter is generally used to extend the life of your alarm as well as to extend the backup battery time during a power failure. -- Adapter Specifications -- Input: 110v AC 50/60Hz Plug End: 2-Flat-Pins Output: 9v DC 300mA Plug End: Straight Plug