HOPESTAR S11 Bluetooth 5.0 True Wireless Bluetooth Earphone (Black)

1. Bluetooth version: 5.0 2. Communication distance: 10 meters 3. Headphone battery capacity: 50mAh, charging compartment battery capacity: 300mAh 4. Use time: about 4 hours 5. Charging time: about 60 minutes 6. Frequency range: 20-20000Hz 7. Impedance: 16 ohms 8. Power input: DC 5V 9. Small size, easy to carry 10. Ergonomic design, comfortable to wear