Bluetooth 5.1 stable support,The of low-power Bluetooth 5.1 chip has more stable signals and faster transmission, so you don't have to worry about intermittent sound when listening to music or talking on the phone. Professional IPX5 level,Deeply waterproof, sweatproof and dustproof, no fear of rain and sweat. Recorder function,14mm F2.0 HD lens, rotatable lens structure, external intelligent noise reduction audio recording microphone. Intercom distance1500-2000 meters, intercom 6 people, one-click interconnection. Product name:Helmet bluetooth headset Product model:S3 PLUS Lens rotation angle:135° wide angle Intercom distance:1500-2000m music time:32 hours Standby time:1000 hours battery capacity:2000mAh Charging time:2-3 hours Bluetooth version:5.1 Waterproof level:IP65 Number of people talking:6 people lens:14MM HD The product appearance and printed words depending on the batch, but this does not affect use. Colour:Black & White Material:Plastic Package Contents: 1 * Helmet bluetooth headset With accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.