LEXIN ELECTRONICS DESIGN FOR BIKE LEXIN Newest BT 1500M wireless Bluetooth interphone Motorcycle Helmet Headset Intercom for 4 Riders talk together at the same time intercomunicadores de motos(super Volume & Music Control--You can easily adjust the volume by short pressing Volume - & Volume + Button Safe Mobile Phone Call Answering And Making--When you have an incoming phone call, you can wait 5 seconds and the headset will answer the call automatically FM Radio Function--Power on the unit, then press & hold the A Button for 3 seconds to enter FM radio mode Intercom Conversation--You can start a wireless rider-to-rider intercom conversation with the other Intercom Rider by pressing the Intercom Button A or B Stereo Music--You can listen to stereo music in either way: by Bluetooth wireless stereo or with the enclosed stereo audio cable