M and S Systems DMC1PACK Whole-House Music and Communication System. 30 Watts RMS power drives up to 15 room stations and 3 door speakers. 30% Smaller than previous models. 2 Music source inputs and whole-house intercom functionality. 8 AM/FM music station presets. Room stations feature remote volume and source control. Privacy intercom only and door release features. Connects with CAT5 cabling. Dimensions: 16 W x 5-1/4 H. Includes DMC1 master unit 4 DMC1RS remote scan speakers 1 DMC1RW outdoor patio speaker 1 MC3 door chime module and 1 DS3B front door speaker.