Type: USB Standards: USB 3.0 Ports: 4 x USB 3.0 type A female 1 x USB 3.0 type B female Transfer Rate: USB 3.0: 5 Gbps Power Input: 5VDC, 2000mA, type M plug Operating System Supported: Windows XP(32/64-bit)/ Server 2003(32/64-bit)/ Vista(32/64-bit)/ Server 2008 R2/ 7(32/64-bit), Mac OS 10.2 ~ 10.6 Note: If used with the Apple Mac OS operating system, this device will function in USB 2.0 mode only. Dimensions: 0.91" Height x 2.68" Width x 3.74" Length Weight: 1.94 oz