Specification: 
Bluetooth v4.0 sport bluetooth earphone
1. Bluetooth V4.0, support all devices with bluetooth function
2. 2mobile phones can be connected at the same time.
3. Bluetooth Working range: 10M
4. Built-in high sensitivity microphone
5. Built-in rechargable battery, battery capacity 90mah
6. Playing music time: 6~7hours
7. Talk time: 10hours
8. Standby time: 200hours
9. Output power: 2x20mW
10. Distortion factor: ≤1%
11. SNR: S/N≥95
12. Charging Time: 2-3h