Features: BT 5.0 has high data transmission speed, stable connection, and low power consumption. Built-in HD microphone, intelligent noise reduction, can call. Bone conduction earphone, open to wearing, do not plug into the ear. IPX8 is deeply waterproof, suitable for swimming, bathroom, and other scenarios. Two-in-one function, with 16G independent memory, supports MP3 playback mode, and can also switch to BT playback mode. Specification: Speaker: Bone conduction headset Play Time: 10 hours Charging Time: 2 hours Standby duration: 7 days Connection range: 10M BT version: V5.0 Speaker sensitivity: 1003db Microphone Sensitivity: -403db Weight: 43g/ 1.52 ounces Package size: 18*14.5*6.5cm Package weight: 178g Package List: 1 * Bone conduction Headphone 1 * USB Cable 1 * User Manual