Features: V5.0 bluetooth-compatible, DSP processing, super CVC-noise reduction, super low power consumption, fast pairing, super long working and standby for time. It can answer, reject and hang up calls within a visible range of 10 meters, and support the connection of 2 mobilephones. In the open visual range, a full-duplex intercom with a distance of up to 800 meters between two bluetooth-compatible walkie-talkies. After the intercom is enabled, the mobilephone is still in the standby state to ensure that no calls are missed. It can realize any switch between mobilephone call, intercom, stereo music and FM radio. Support voice communication at a speed of 120 for km/h. Specifications: Material:ABS Working distance: 800 meters Working frequency: 2.4GHz Battery type: 600mAh rechargeable lithium polymer Charging interface: TYPE-C interface Waterproof Level:IP65 Net Weight:255g Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Helmet Intercom