Logitech H390 Usb Headset Headphones

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