Linear DMC1 M & S Systems Music Communication Master Unit Supports up to 15 room stations and 3 door speakers 30 Watts (RMS) maximum output power , Frequency Response Range - 20 Herts -20kilo Hertz 2 music source inputs and 8 AM/8FM radio station tuner presets Remote volume and source control from room stations Privacy, intercom, only, and door release features 30 Watts RMS power drive up to 15 room stations and 3 door speakers 30% smaller than previous models 2 music source inputs 8 AM / 8FM music station presets Speaker remote volume and source control