Connectland USB 2.0 Stereo On Ear Computer Headset with Built-In Boom Microphone Over the head, on the ear design Stereo headset Sound chip Built-in enable this Device to work with computer had No sound card Control on the cable for Easy Volume, and mute control Microphone unit: 9 x 7 mm at 58 (+-) 2 dB Impedance: 32 O Connectivity technology : Wired