For Bicycle Helemt Intercome bluetooth Headset (10

1.Maximum talking range 100 meters between two riders, real two-way wireless communication between three riders by Bluetooth system. 2.Real two-way wireless communication between three riders by Bluetooth system. 3.Receive and reject phone call,call out and hang up. 4.Auto answer phone call. 5.Stereo music/audio function(transmits from A2DP enabled cellphone/MP3/GPS) 6.Could be connected with GPS. 7.Freely switch between Phone call,Bluetooth Intercom,Music. 8.Support 3 people talking at the same time. 9.DSP Noisy supression technology and Mic echo cancellation to ensure high quality sound even in high speed. 10.Up to 120 Km working speed. 11.Up to 7 hours talking time. 12.Water-resistance,all weather-Perfectly Work! Advanced A2DP & EDR bluetooth profile. Maximum talking range 500 meters between two riders, real two-way wireless communication between three riders by bluetooth system. Embedded FM Radio. TTS function that can speak out the Caller Number.