M99 Bluetooth V5.2 Earhook Earphone 1. Teeth version: V5.2 EDR 2. Transmission distance: about 10 meters 3. Headphone battery: 350mAh 4. Wiress frequency: 2.4GHZ 5. Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11. 36. Charging voltage/current: 5V/1A 7. Charging time: about 2 hours 8. Speaker impedance: 8mm 32 ohms 9. Microphone sensitivity: -42dB 10. Headphone weight: about 15.2g 11. Headphone size: about 7.4x6x2.2cmFeatures: 1. Soft rubber ear hook design, can be adjusted according to different ear types, automatically fit, no feing to wear, more comfortable 2. The direction of the horn can be rotated, and the left and right ears can be worn and used, which is comfortable and firm 3. 10-core loudspeaker, HIFI high-fidity sound 4. Intligent AI noise reduction, HD calling 5. Low power consumption 5.2 chip, low latency, more stable 6. Two earphones can form a TWS function binaural earphone 7. One-key control, easy to use