Specification: 
Bluetooth v4.1 sport bluetooth earphone
1. Bluetooth V4.1, support all devices with bluetooth function
2. Built-in high sensitivity microphonesupport handsfree phone call
3. Built-in rechargable battery, battery capacity 60mah
4. Playing music time: 2~3hours
5. Talk time: 3hours
6. Standby time: 80hours
7. Output power: 2x20mW
8. Distortion factor: ≤1%
9. SNR: S/N≥95
10. Charging Time: 1h