Package Included: 1 x Super Speed 3.0 USB(without retail package) Compliant with USB version:1.1/2.0/3.0 Supports High-Speed(5G Mbps),Full-speed(480Mbps) and Low-speed(12Mbps) USB device profiles when power adaptor connected,Per-port Over-Curret detection and protection (Excluding power) when power adaptor connected,Supplies USB bus power(Excluding power) Can be driven 500Gmobile hard disk without external power supply Backflow prevention circuit design,in order to prevent electric current flow back to the device Automatic switching between self-powered and bus-powered mode Supports Plug&Play Dimension: 1.7 x 4.2 x 1.1cm(L x W x H) System requirements: windows XP, vista, win7, Mac OS (10.X or above) Connects to scanners, printers, digital cameras, camcorders, speakers, mice, keyboard, external drives, MP3 players and more. Color: Black