1. Support TF memory card (8G)
2.MATERIAL: ABS
3. Steady sunken design to wear and fit the ear shape.
4. Bluetooth 5.0 receive signal anti-interference strong stability clear call restore fidelity
5. 200mAh high capacity battery 18 hours of listening more than 150 days of standby.
6. Horn diameter: 6mm
6. Speaker Sensitivity: 98 +/- 3DB
7. Speaker impedance: 16 ohms +/- 15%
8. Speaker frequency response range: 20Hz-20KHZ
9. Microphone sensitivity: -42 +/- 3db
10. Microphone frequency response range: 100HZ-8000KHZ
11. Effective distance: less than 10 meters.