M&S SYSTEMS DMCBT Music-Intercom System with Bluetooth(R) Player (White)Streams music or other audio to the main intercom allowing sound to be distributed around home Includes a pop out flat dock to house a smartphone or other device Dock includes 3. 5mm audio input & USB A charging port for convenience Functions as a wall mounted speakerphone to allow a Bluetooth(R) enabled smartphone to accept calls by pressing a button on the intercom Features 2 microphones & a speaker on the front of the unit for communicating hands