INTERPHONE F3 Passenger Motorcycle Motorbike Bluetooth Helmet Intercom Headsets Wireless Bluetooth technology Full-duplex communication with DSP processor and wind-shield Hi-Fi speakers with automatic speed-noise compensation Excellent performance up to 180 Km/h (This parameter may be affected by factors such as the environment, traffic, motorcycle and helmet noise levels) Conversation time (intercom+telecom+music): up to 8 hours