Trust Silverline Headset 625. Device connectivity: Wired. Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом, Headphone sensitivity: 105 dB. Microphone frequency: 20 - 20000 Hz, Microphone sensitivity: -54 dB. Dimensions (WxDxH): 180 x 70 x 170 mm. Minimum system requirements: Audio device with 3.5 mm stereo audio output 3.5 mm microphone input