Technical parameters : 
Mic :Directivity: Omnidirectional
Impedane: ≤2.2kΩ
Sensitivity: -45土3dB
headphone: Impedance:32Ω
Frequency response: 20Hz-20KHz
Sensitivity: -98dB土3dB
Dimension: ∅9.7*6.7mm(MIC), ∅40mm(Speaker Driver) 
Weight: 210g