Features: Full duplex talking, support any 2 paired riders to talk at the same time within a maximum range of 1200 meters (straight line unobstructed). Adopt professional CSR BT intercom+RF chip, the signal is more stable. It allows easy pairing of up to 6 riders, including a host and 5 subs. After pairing with your phone via BT, this motorcycle BT intercom will automatically answer calls after 3 seconds, you can also listen to GPS navigation or listen to music while riding. ESP noise reduction, supports A2DP high-quality stereo sound, which helps reduce annoying noise caused by wind, engine and surroundings. Built-in 850mAh large capacity battery, long stand-by and working time. Specification: Brand: Teleheer Color: Black BT version: V5.1 Speaker power: 0.25W Battery capacity: 850mAh Working voltage: 3.3V-4.2V Item size: 8.8 * 4 * 2.2cm /3.46 * 1.57 * 0.87in Item weight: Approx. 44g /1.55oz Packing list: 2 * Intercom 2 * Headphone 4 * Magic sticker 2 * Mounting clamp 4 * Screw 1 * Screw bolt driver 2 * USB cable 1 * User manual