M1S Bone Conduction Stereo Vibrator Speaker Bluetooth Earphones(Green) Filter-More Brand Cases strong cloth spacer to keep

strong cloth spacer to keep your phone safe and within your sight

which can meet the transceiver function at the same time

and the inner layer is made of OFC wire

the color will not fade after washing

M1S Bone Conduction Stereo Vibrator Speaker Bluetooth Earphones(Green) Filter-More Brand Cases strong cloth spacer to keep1. Bluetooth version: V5. 3+EDR 2. Speaker type: bone conduction 3. Oscillator frequency: 20Hz 20KHz 4. Impedance: 32 ohms 5. Sensitivity: 85dB mW 6. Waterproof rating: IPX 6 7. Play time: about 7h 8. Battery capacity: 150mAh 9. Play time: about 6 8h 10. Standby time: about 150h 11. Charging time: about 1. 5h 12. Frequency band: 2. 4GHZ 13. Bluetooth protocol: A2DP1. 3 AVRCP1. 5 HFP 14. Weight: about 23g Features: 1. Dual silicon microphones, tuning