Features:(1).V5.0 Bluetooth, DSP processing, super CVC noise reduction, super low power consumption, fast pairing, super long working and standby time; (2).It can answer, reject and hang up calls within a visible range of 10 meters, and support the connection of 2 mobile phones; (3).40mm tuning speaker diaphragm, shocking music; (4).In the open visual range, a full-duplex intercom with a distance of up to 800 meters between two Bluetooth walkie-talkies. After the intercom is enabled, the mobile phone is still in the standby state to ensure that no calls are missed; (5).It can realize any switch between mobile phone call, intercom, stereo music and FM radio; (6).You will be able to connect with other brand products via Bluetooth, and have a smooth intercom. (7). Support voice communication at a speed of 120 km/h; (8).The waterproof and sun-proof design of the whole machine is durable, and the waterproof grade reaches IP65. Specification: Working distance: 800 meters Working frequency: 2.4GHz Bluetooth version: Bluetooth 5.0 Support Bluetooth protocol: A2DP and AVRCP Support Bluetooth function: Bluetooth headset with automatic detection function and hands-free profile. Battery type: 600mAh rechargeable lithium polymer Standby time: up to 300 hours Talk time: up to 18 hours for mobile phone talk/listen to music; up to 15 hours for intercom. Charging time: about 2 hours Charging interface: TYPE-C interface Colour:black Material:ABS+Electronic components type: A Package Contents: 2 x Bluetooth Host 2 x Integrated full helmet microphone speaker 2 x Base 2 x Charging cable 1 x English manual Only the above package content, other products are not included. Note: Light 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.