Feature: 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-Current detection and protection (Excluding power) When power adaptor connected， Supplies USB bus power (Excluding power) Every port with independent control switch Every port has LED power light 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!#!amp!*!amp;Play Dimension: 16.5 x 4.7 x 2.1cm (L x W x H) System requirements: windows XP， vista， win7， Mac OS Electric current of the port reach 500mA Connects to scanners， printers， digital cameras， camcorders， speakers， mice， keyboard， external drives， MP3 players and more. Color: Black Package Included: 1 x 7 Port Hi-Speed USB 3.0 Hub 1 x USB cable