The USB 3.0 4 port hub supports USB Super Speed 5Gbps and backwards compatible with previous USB specifications. The 4 Port hub can be used with or without the supplied power supply. 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 Supports powered or bus powered modes Compatible with Windows XP Vista Win 7 Win 8 and MAC 9.x and above Contents: 4 Port Hub 5v 3.5A PSU USB 3.0 A to B cable