Links USB 3.0 Hub 4 Port Compact hub with a Built-in 1ft USB 3.0 Cable for Laptops, Ultrabooks and Tablet PCs with USB Ports, Bus-Powered Required no External Power Supply 1.SuperSpeed USB 3.0 supports transfer rates up to 5 Gbps - The actual transmission speed is limited by the setting of the device connected; Backward compatible with USB 2.0/1.1. 2.Massive expansion, Provide 4 ports USB3.0 to connect 4 USB devices for accessing; Backward Compatible with USB 2.0; Support for Windows 8/ 7/ Vista/ XP, Mac OS X 10.8.4 3.Plug and play, Supports hot Swap; Compact and portable; Length of the USB cable of 30cm, Special for Laptop/ Ultrabook/ MACBOOK/ Tablet PC and PC 4.Safe and reliable; Build in Overvoltage/Overcurrent/Leakage and Short-Circuit protection unit; The connection cable is attached to the hub -no need to worry about leaving it behind or losing it 5.High Performance with VIA VL812 Chipset; Slim Size - Easy Carrying and Experience; Powered via USB - No Additional Power Adapter and Driver is needed