dodocool Superspeed USB 3.0 4-Port HUB for Ultrabook Notebook VL812 Chipset (Black) Complys to USB3.0 specification and 5Gbps theoretical transmission speed. Downwards compatible with USB2.0 and USB1.1. 4 * USB3.0 ports support 4 USB devices used at the same time. Uses VLI812 high performance chipset, more stable and secure. Unique over-voltage protection and current overload protection effectively protect HUB and connected devices. Plug & Play, support hot-swap, no driver needed. Adopts high-strength ABS material, compact and stylish, lightweight and solid. Small size and portable, specially designed for tablet PC, Ultrabook, notebook, etc. Support Windows 2000/XP/Vista/7; Mac 9.1/10.2 above.