VMALL Logitech H540 USB Computer Headset with Noise-Cancelling

-Microphone Type: Bi-directional

-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

-Packages: USB Computer Headset

-Warranty: 2Years