Bluetooth Motorcycle Helmet Headset Full-face Sports Interphone Motorbike Wireless 6 Riders Handsfree BT Low-Profile Headphone Talk for Riding, Trip, Cruise, Offroad, Snow Sport Vnetphone (6 Pack) Motorcycle Long working time: Up to 8 hours talk time, 150 hours standby time Mini size and lightweight motorbike intercom Long distance intercom: 500M (1640ft) Intercom, 6 riders' communication(but only 2 riders intercom at the same time) Attention please: 1. Please use screwdriver to adjust the mount bracket clipping distance; 2. This motorcycle helmet Bluetooth headset intercom fit for full face helmet and helmets that can cover the ears; 3. It can't hear music and talk on phone at same time; 4. When you use the headset, please insert it into the Bluetooth Receiver in all(Please refer to picture 4 on the left side.); 5. To increase the volume largely, you can download a volume booster app in your phone