Aluratek 4 Port Hi-Speed USB 2.0 Hub (AUH1204F) Bus powered so no external power is necessary such as and AC adapter Supports USB 3.0, USB 2.0 and USB 1.1 Ports on your computer guaranteeing compatibility Hi Speed data transfer rates up to 480 Mbps Supports All Mac and PC Computers currently on the market running Windows or Apple OS Life Time Warranty Bus powered so no external power is necessary such as and AC adapter Supports USB 3.0, USB 2.0 and USB 1.1 Ports on your computer guaranteeing compatability Hi Speed data transfer rates up to 480 Mbps Supports All Mac and PC Computers currently on the market running Windows or Apple OS Life Time Warranty Portable and ideal for travel or home use