Logitech H110 Stereo

Microphone Type: Bi-directional
Input Impedance: 32 Ohms
Sensitivity (headphone): 100 dB +/-3 dB
Sensitivity (microphone): -58dBV/μBar, -38dBV/Pa +/-4 dB
Frequency response (Headset): 20Hz-20KHz
Frequency response (Microphone): 100Hz-16KHzM