Cellular Line Interphone F4 PLUS DUAL Stereo Bluetooth Handsfree Motorcycle Speakerphone Kit (2 Units) TELEPHONE FUNCTIONS - Hands-free Dualphone (connection with 2 telephones at the same time) Voice call and answer functionality. INTERCOM FUNCTIONS - Bike-to-bike or pilot-passenger intercom connection STEREO FUNCTIONS - Wireless hi-fi stereo connection with Bluetooth A2DP music players Remote controls music commands AVRCP