Logitech H540 USB Headset – Black

Input Impedance: 20 Ohms\

Sensitivity (headphone): 115 dB +/-3 dB

Sensitivity (microphone): -42 dBV/Pa +/- 3 dB

Frequency response (Headset): 20 Hz – 20 KHz

Frequency response (Microphone): 100 Hz – 16 KHz