This USB hub is easy to use; it is a plug-and-play external device so you do not need to worry about installing new software in your computer. It supports Linux, Windows XP, Vista, 7 and 8, and MAC 9.1, 10.2 or above. According to the manufacturer, this product features over-current detection and protection. It is also compact (8 x 2.4 x 0.8 inch) and weighs only 4.7oz.The hub can function in super-speed mode (5Gbps rate) if you connect it to a USB 3.0 compliant host. If you just connect it to a USB 2.0 or 1.1 compliant host, it will operate in high-speed (480 Mbps), full-speed (12 Mbps), or low-speed (1.5 Mbps) mode. The blue LED light indicates that the USB port is being used.