Cardo Systems Scala Rider G4 Powerset Bike-to-bike intercom communications with 3 other headsets with a remarkable range of up to 1 mile (with flip up antenna for extended range.) Link together for 4-way intercom conference calling between 2 couples riding on 2 motorcycles (full duplex) VOX Activation: intercom calls, answer, voice dial, redial and call reject functions Includes an embedded FM radio with scan and seek features and 6 station channel memory Multi device compatibility headset is compatible with the following types of devices: (a) A Bluetooth enabled mobile phone (for hands-free communication), (b) A stereo Bluetooth enabled MP3 player, adapter or mobile phone (for wireless music), (c) A non-Bluetooth enabled MP3 player (accepts MP3 card), (d) A Bluetooth enabled GPS unit (for in-helmet voice instructions) GPS must support headset connectivity, (e) A Scala Rider Q2 headset (for hands-free communication up to 500m/1,640ft), (f) Scala