Kingwin KWZ-400 Aluminum 4-Port USB 3.0 Hub Type: USB Standards: USB 3.0 Type-A Ports: 4 x USB 3.0 Transfer Rate: Up to 5 Gbps Operating System Supported: Windows XP/ Vista / 7 /8, Mac OS10.2 and above Dimensions: 3 3/4 x 1 3/16 x 13/16 Weight: 0.16 lb.