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The USB 3.0 4 port hub supports USB Super Speed 5Gbps and backwards compatible with previous USB specifications. The 4 Port hub is bus powered via USB. Specification USB 3.0 Compliant 4 Port Hub Supports Super Speed 5Gbps Backwards compatible with USB 2.0 1.1 and 1.0 USB and ACPI complaint Plug n Play Bus powered Compatible with Windows XP Vista Win 7 Win 8 and MAC 9.x and above Contents: 4 Port Hub