1. USB 2.0 3-Port Hub with Stereo Sound Adapter Combo is designed especially for laptops, tablets, and ultrabooks and expands one USB 2.0 high-speed port into three easily. 2. It is also a highly flexible audio interface, which can be used with either laptop or desktop system; Simply Plug the Sound Adapter into your USB port, and then plug your headphones into the Adapter. 3. Feature of Stereo Sound Adapter 4. 3D stereo USB audio adapter 5. Backward compatible with USB 1.1 /2.0 - Connectors: USB type A, stereo output jack, microphone input jack No external power required Plug & Play, no drivers needed Input: USB2.0 Output: 3-ports USB2.0, CTIA OMTP Audio jacks, Micphone jack. Sound Card: 7.1 Channel Audio OFF/ON switch colour:Black Material:PC+ metal size:The size: Approx. 90 x 31 x 11mm The cable length: Approx. 45cm Package Contents: 2 x USB2.0 Hub with Stereo External Sound Card Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.