Macally U3HUBGB is a 3 port SuperSpeed USB 3.0 hub with a Gigabit Ethernet port connection speeds at 10/100/1000. Built-in USB 3.0 cable for easy portability with backward compatibility to USB 2.0. Designed to work without AC adapter but it does include one for high power consumption devices. It is sleek and compact and designed to work on Mac and PC. Compatible with Mac OS X 10.7 and above, Windows XP/Vista/7/8 and above on any desktop or notebook computer with an available USB 3.0 or 2.0 port.