M&S Systems DMCBTB Music/Intercom System with Bluetooth Player (Black) Streams Music Or Other Audio To The Main Intercom Allowing Sound To Be Distributed Around Home Dock Includes 3.5mm Audio Input & Usb-a Charging Port For Convenience Functions As A Wall-mounted Speakerphone To Allow Bluetooth-enabled Smartphone To Accept Calls By Pressing A Button On The Intercom Dock Includes 3.5mm Audio Input & Usb-a Charging Port For Convenience Outbound Calls Can Also Be Made Through Connected Smartphone