Trust SILVERLINE HEADSET. Interface type: 3.5 mm stereo headphone gold plated plug 3.5 mm microphone gold plated plug . Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 98 dB. Microphone frequency: 20 - 20000 Hz, Microphone sensitivity: -54 dB. Dimensions (WxDxH): 150 x 45 x 170 mm. Minimum system requirements: •Audio device with headphone output •Microphone input for optimal performance