Compliant with the USB version:1.1/2.0/3.0 Supports High-Speed(5G Mbps),Full-speed(480Mbps) and Low-speed(12Mbps) USB device profiles When adaptor connected, Per-port Over-Current detection and protection (Excluding ) When adaptor connected, Supplies USB bus (Excluding ) 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, OS (10.X or above) Connects to scanners, printers, digital cameras, camcorders, speakers, mice, keyboard, external drives, MP3 players and more. Colour: black Material: ABS Package Contents: 1 * USB hub 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.