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The M&S Systems® DMC3-4 3 or 4 wire music/communication retrofit system master unit can replace older intercom systems that use three-wire or four-wire connections to the room stations. This system supports up to 15 room stations, up to three door speakers and the built-in AM/FM radio tuner allows setting eight AM station presets and eight FM station presets. Features backlit liquid crystal display shows the operation mode, audio source, radio frequency, volume setting and time. The optional three-note model MC3 provide a selection of door chime sounds.