Intelligent audio processing 12th generation noise reduction technology Intelligent identification of audio sources, shielding noise, clear calls, and enjoy perfect sound quality A variety of practical functions to meet your needs, enabling arbitrary switching between mobile phone calls, walkie-talkies, stereo music and FM reception A two-person walkie-talkie that can connect to two other devices at the same time via Bluetooth for sharing 40mm tuned speaker diaphragm, shocking music, brings you immersive 3D surround effect Sun protection design is . The waterproof and sun protection design of the whole machine is and the waterproof grade is IP65 Name: Motorcycle helmet Intercom Intercom distance: 800 meters(perfect state) Bluetooth version: Bluetooth 5.1 Battery type: 700mAh rechargeable lithium battery Standby time: up to 300 hours Call time: Talk time for up to 15 hours Charging time: approximately 2 hours Material: ABS colour: Black Package Contents: 1 x Bluetooth host 1 x Headphones & Microphone 1 x Nylon Sticker clip 2 x Nylon Sticker 1 x Clip 4 x Speaker Nylon Sticker 1 x Data cable 1 x screwdriver 1 x Chinese and English instruction manual 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.