The D-Link DUB-A2 USB 2.0 PCI Card adds two USB 2.0 ports to your PC. If your PC dsn't have USB 2.0 ports, simply plug it into a PCI expansion slot inside your PC, and you'll have two super fast USB 2.0 ports. The new USB specification gives you transmission at up to 480Mbps. That's about 40 times faster than USB 1.1, the earlier USB specification. Many USB 2.0 products are now beginning to be out in the market, so you'll need this card to get fast connection. The two ports provided let you plug to USB-supported devices and USB hubs. The card supports low-speed 1.5Mbps devices, full-speed 12Mbps devices and high-speed 480Mbps. Each port on the card creates a bridge between the attached USB peripheral or USB hub and the host computer.