Ear Hook Stereo Headset. USB Interface. This headset with its fashion design has been created for multimedia, gaming, Internet and IP Phone applications. Its comfortable headset allows long duration of use. Connect the 3.5 mm stereo plugs of the headset to Line Out and microphone plugs of your audio peripheral. Adjust headphones sound on the volume switch on the cable. Microphone Unit: 9 x 7 mm at 58 (+-) 2 dB. Impedance: 32 O. Directivity: Omnidirectional. Speaker: 40 mm. Sensitivity: 108 dB. Frequency Response: 20 Hz - 20,000 Hz. Rated Power: 100 mW. LED indicator for power and micro mute. Volume adjustable and mute volume