Spec Sheet Preview: The Alpha Communications® / Elvox 6680 amplifier/power supplies are used with the 6300 series video-intercom systems (or equivalent), to provide intercom amplification, power to operate the electric door opener(s) etc., and power to operate the video monitor units, for a single building entrance. The 6680 units each require a standard 120VAC power source. T hese 6680 amplifier/power supplies are designed to easily surface mount right onto the finished wall by means of customer supplied screws. …