2000M Maximum Distance & Music Sharing is equipped with Bluetooth 5.0 version, It has high compatibility and stability. If there are no obstacles such as buildings in a straight line, the motorcycle helmet intercom maximum communication distance of the group is about 2000 meters, all riders can speak with clear sound quality. It also featured music sharing that allows two riders enjoy the same song during their trip. Method: turn on 2 units and pair them successfully, pause the music first, then press and hold the volume button "-" and the function button(the largest button) on one of the units at the same time for 3 seconds until you hear the beep: start sharing music.Support 8 Riders Group IntercomFull duplex call for group motorcycle headsets system, Support for multiple people simultaneous call. With M1-S headsets, you can ensure hands-free security and convenience, listen to music, retrieve GPS routes, and receive voice commands wirelessly via Bluetooth, let you enjoy racing fun.Crystal-Clear Sound Quality & HandsfreeThis helmet headset intercom uses high sound quality full-range membrane monomer. The M1-S Pro has high definition sound quality, especially for the bass has a high reproducibility. M1-S Pro has handsfree function, the factory setting defaults to manual answering, Switch manual/automatic answering calls: While in standby, press and hold the intercom button and volume + - button at the same time for 3 seconds, you can set it to your liking.Noise Reduction & WaterproofSince the microphone of motorcycle bluetooth headset has a CSR chip, ambient noise such as wind noise and engine noise are not annoying. The voice quality is not affected even at high speeds. Moreover, it is waterproof and dustproof, can be used in any weather conditions.Long Standby Battery & Two Options For MicrophoneThe motorcycle helmet communication with 900mAh rechargeable battery, Standby Up to One Week, working time up to 20 hours. M1-S Pro bluetooth motorcycle headset has hard mic and soft mic, Suitable for all kinds of helmets. You can choose the hard mic for open face helmet, and soft mic for full face helmet.