M1S Bone Conduction Stereo Vibrator Speaker Bluetooth Earphones, M1S Red, M1S Green, M1S Black, M1S Pink1. 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

Rugged Design: The case offers complete coverage

1 to 6 levels and so on

translucent silicone shell

Radio sensitivity: -38db Effective distance: Greater than or equal to 10 meters

SATA3 6Gb/s high-speed interface and CMOS low-power technology are adopted to effectively reduce the power consumption

10kgs / 17

2-in-1 Audio & Mic: The multiport mini dock 2-in-1 audio/mic port provides high-quality sound and audio capture

Working range: 300m

doorknobs etc

improve super smooth

VESA Compliance: 75 x 75 mm

wide angle