Features: 1. Integrated BT 5.0 chip, offers fast speed, stable connection, allows transmission of 10-15 m without obstacle. 2. Compatible with mainstream devices, suitable for multi-platform, multi-system, and major brand mobile phones. 3. Effectively block external noise, and real-time audio calibration can maintain a high-quality listening experience. 4. Ergonomically designed to fit each ear perfectly. Perfect for exercise, running, sports and games. 5. The battery 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: Bluetooth-Compatible version: V5.0 Working voltage: 3.2V~3.4V Headphone speaker: 8mm Headphone battery capacity: 50MAH Charging box battery capacity: 450MAH Transmission distance: >10m Talk time: 4-5 hours Playing time: 4-5 hours Headphone charging time: 1.5 hours