Come and see our amazing products. This 4 ports hub splitter provides an external power plug to supply power for one USB 3.0 connector and three 2.0 connector,up to 900mA max fit 5v1A and 5V2A. It's compatible with Windows XP, for Windows Vista, for Windows 7 & for OSX. This adapter works normally by bus-power, or with an external power adapter. Website price is for USB 3.0 if you need cheap option USB 2.0, pls contact us freely! Pls confirm with us about the packing info, stock color and exact production time before placing your order.