Logitech H111 Stereo Headset, Analog * Input impedance: 32 Ohm * Sensitivity (Earphones): 100 dB + / -3 dB * Sensitivity (Microphone): -58 dBV /? Bar, -38 dBV / Pa +/- 4 dB * Frequency Transmission (Headset): 20 Hz - 20 kHz * Frequency Transmission (Microphone): 100 Hz - 16 kHz * Cable length: 1.8 m