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Compatibility: STS-4xx Series (Full List in Description)
Power Adapter Overview This is a replacement 16.5 volt power adapter for our 451 alarm systems. The power adapter for the United States. -- Power Adapter Specifications -- Input: 110-240v AC 50/60Hz Plug End: 2-Flat-Pins Output: 16.5v DC Plug End: Round 90 Degree Angle, Internal Diameter: 4.4mm, External Diameter: 6.5mm