The hi speed usb 20 4 port mobile hub provides four downstream usb ports that offer easy plug and play connectivity to your usb 11 and usb 20 devices it lets you easily connect up to four of your usb 11 and 20 devices to your computer such as an ipod or other mp3 player digital camera or printer its compact size makes it a perfect travel tool designed to easily tuck into the pockets of a laptop bag