M99 Bluetooth V5.2 Single Earhook Business Headphone(Black+White) Filter-Protective Case and the function is clear

and the function is clear at a glance

Expansion port: HDMI 4K HD

Maximum/minimum record of liquid surface depth

not easily deformed

M99 Bluetooth V5.2 Single Earhook Business Headphone(Black+White) Filter-Protective Case and the function is clear1. Teeth version: V5. 2+EDR 2. Transmission distance: about 10 meters 3. Headphone battery: 350mAh 4. Wireless frequency: 2. 4GHZ 5. Supported protocols: A2DP1. 3 HFP1. 6 HSP1. 2 AVRCP1. 6 D11. 3 6. 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. 2cm Features: 1. Soft rubber ear hook design, can be