Has a Multi-function Control Box with
1)Volume control function
2)Headphone on/ off switch
3)Microphone on/off switch
4)A extra 3.5mm Jack for another Headphone to enjoy the perfect sound at the same time.

Microphone: Φ 6.0*5.0mm
Sensitivity: 54dB± 2dB(odB=1V/ubar)
Direction: Noice Cancellation
Impedance: ≤ 2.2KΩ
Current consumption: 2.0V
Sensitivity deduction: In 1.5V/H-3dB
SNR: > 58dB
Loudhailer: Φ 40.0mm
Impedance: 32ohm
Frequency: 20-20Kz
Sensitivity: 98.0dB± 3dB