The DU-520 is a 5-port Universal Serial Bus (USB) 2.0 PCI adapter for upgrading desktop computers to the new USB standard. This card is designed to work with mice, keyboards, external CD-R/RWs, external hard drives, webcams and other USB enabled devices. It is 40 times faster than previous USB adapters. The five USB 2.0 ports can transfer data at 480 Megabits per second, making it ideal for external storage, backup, networking and video devices.??The DU-520 is backward compatible with USB 1.0 and USB 1.1 products. This gives you the ability to connect all of your USB 1.x devices to the DU-520 USB 2.0 adapter and they will work. Each port detects whether the connected device is USB 1.x or USB 2.0 and automatically runs the device at the correct speed. Plug-and-Play installation makes the DU-520 easy to install. In addition, because the DU-520 is USB-IF certified, the hardware and drivers meet the rigid demands of these standards.