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. Compatible with mainstream devices with BT function, suitable for multi-platform, multi-system, and major brand mobile s. 3. The 2000mha large-capacity charging compartment can not only charge heads, but also act as a mobile charging source for emergency charging of electronic products. 4. The in-ear heads are ergonomically designed to fit each ear perfectly. Perfect for exercise, running, sports and games. 5. The digital display shows the remaining battery power of the cordless headset clearly, then you have the charge status of your device at all times. 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: Chip: Jerry 6963 Bluetooth-Compatible Version: 5.1 Head speaker: 8mm Head battery capacity: 50MAH Storage box battery capacity: 2000MAH Transmission distance: >10m Talk time: 4 hours Play time: 4 hours Charging time: 1-2h includes: 1 set of Ears