Monster XKT09 Wireless Bluetooth 5.2 Gaming Earphones Surround Sound with Mic

Bluetooth version:AB5636/V5.2
Speaker size:Φ13mm
Speaker impedance: 32Ω
Speaker sensitivity:   107±3 dB 
Frequency Response: 20HZ-20KHZ
Battery talk/music time: about 4H+14H
Battery capacity: 30mAh+300mAh
Battery charging time: about 1.5H
Charging interface: Type-c