Professional Motorcycle Motorbike Sports Phone Bluetooth Helmet Headset Earpiece Directly talk via bluetooth,working as interphone, More than 100 meters available. Real two-way wireless communication between three riders by Bluetooth system. Receive and reject phone call,call out and hang up. Auto answer phone call. Stereo music/audio function (transmits from A2DP enabled cellphone/MP3/GPS) DSP Noisy supression technology and Mic echo cancellation to ensure high quality sound even in high speed. Up to 120 Km working speed. Up to 7 hours talking time. Water-resistance,all weather-Perfectly Work! Freely switch between Phone call,Bluetooth Intercom,Music.