M21 TWS Bluetooth Headphones With Microphone Couple Wireless Earphone 9D Stereo Sports Waterproof Four Earbuds Headsets

Bluetooth specification: V5.2. Bluetooth Profile: A2DP, AVRCP, HFP, HSP. Working voltage: 3.1V~4.2V. Charging voltage: 5V-1A. Battery capacity of the headset: 50MAH. Battery capacity of the storage box: 2000MAH. Transmission distance: 10M. Call time: 4-5h. Play time: 4-5h. Waterprof: IPX7. Charging time of headset: 30-45min. Charging time of the Charging box: 1h. Note: M21 can be used with one ear and two ears, not all earbuds on a single device. Product Specification: 1. Bluetooth specification: V5.2. 2. Bluetooth Profile: A2DP, AVRCP, HFP, HSP. 3. Working voltage: 3.1V~4.2V. 4. Charging voltage: 5V-1A. 5. Battery capacity of the headset: 50MAH. 6. Battery capacity of the storage box: 2000MAH. 7. Transmission distance: 10M. 8. Call time: 4-5h. 9. Play time: 4-5h. 10. Waterprof: IPX7.11. Charging time of headset: 30-45min. 12. Charging time of the Charging box: 1h. Product include: 4 Bluetooth headsets, 1 Charging box, 1 Charging cable, 1 User Manual