LOGITECH USB HEADSET 390
Microphone Type: Bi-directional
Input Impedance: 32 Ohm
Sensitivity (headphone): 94 dBV/Pa +/- 3 dB
Sensitivity (microphone): -17 dBV/Pa +/- 4 dB
Frequency response (Headset): 20 Hz - 20 KHz
Frequency response (Microphone): 100 Hz - 10 KHz
USB Computer Headset