Features: 1.Integrated BT 5.1 chip, offers fast speed, stable connection, allows transmission of 10 m without obstacle. Effectively block external noise, and real-time audio calibration can maintain a high-quality listening experience. 2.Bone conduction design instead of in-ear, reduce the pressure inside and outside the ear, less damage to the hearing, and increase the comfort. 3.The built-in battery can last about 10 hours for listening to music when fully charged, and about 10 days for long standby time. 4.Memory titanium alloy skeleton, according to different head shapes and sizes, can be arbitrarily twisted and not easily broken. 5.The open-ear headphones are ergonomically designed to fit each ear perfectly. Perfect for exercise, running, sports and games. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Bluetooth-Compatible Version: 5.1 Speaker: 16mm Transmission distance: >10m Talk time: 8 hours Play time: 10 hours Standby time: 10 days