Running out of USB Ports? Look no further. The D-Link DUB-H7 is a portable solution to your problems. It allows for up to 7 additional USB ports for your system. Needing no power source, the DUB-H7 is a great and inexpensive way to increase the USB ports on a computer. Its size and lack of a power supply make it extremely portable and easy to move from computer to computer or take on the road.