Hub connects up to ten devices to your computer. Self-power allows it to function without external power in virtually all cases. Compact AC adapter included for connecting very high power-draining devices. Two of the ports swivel for easy access and connection to smaller devices, such as MP3 players. Backward-compatible with USB 1.1. Number of Ports: 10; For Use With: Multiple USB Devices To 1 Computer; Transfer Rate: 480 MBps.