heneng Motorcycle Helmet Wireless Headset Intercom Full-face Sport Speaker Low Profile Wireless Headphone 6 Riders Communicator 500m Talk for Riding, Trip, Cruise, Offroad, Snow Vnetphone(2 Pack) INTERCOM-- Helmet communicator supports 6 riders, a host and 5 auxiliaries. After pairing, the host can choose any one of the 5 to talk. (but only 2 riders interphone at the same time). one year warranty DISTANCE-- Motorcycle helmet headset with 500 meters operating range WORKING TIME-- Motorcycle helmet communication system kit up to 8 hours talk time, 150 hours stand-by time for full charge. NOISE CONTROL-- Noise suppression technology can provide best sound quality for both incoming and outgoing sound NOTE:1. Please use screwdriver to adjust the mount bracket clipping distance; 2. This motorcycle helmet 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 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