Features: 1. Integrated BT chip, offers fast speed, stable connection, allows transmission of 10 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. Rechargeable battery. Long battery life, can provide full-featured wireless playback. Perfect for exercise, running, sports and games. Description: Speaker : 40mm Battery: 150mAh Using time: 8-12hours Charging Time:2hours Transmission distance: 10-15 meters Vocalization principle: Dynamic Active noise cancellation: Yes Volume Control: Yes Wireless Type: Bluetooth 5.1 Ear cushions: Memory Foam With microphone: Yes Charging method: CABLE Size: 20*19cm Include: 1 x Headset 1 x Charging Cable