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Aiphone Corporation DBS-1A Kit consists of DB-1MD and DA-1DS. Power supply required 15 VAC 1100. (Not supplied in kit). Features include: Connect electric door release with two wires from door station. Requires no extra power supply for door release. An AC operated door strike is required. Existing doorbell or chime wires can be utilized (disconnect from transformer). Internal stations are equipped with door release and one function button to turn on entrance light, etc. Optional call extension sounder. Connect up to 4 additional sub stations. Chime tone calling. All call between internal stations. ABS plastic construction.