The DUB-C2 is a Hi-Speed USB 2.0 2-port CardBus adapter that upgrades notebook computers to the new and faster USB standard. This card is designed to work with mice, keyboards, external CD-R/RWs, external hard drives, PC cameras, and all other USB enabled devices. It is 40 times faster than previous USB adapters and 20% faster than Firewire (IEEE-1394). Each of the two USB 2.0 ports transfers data at 480Mbps, making it ideal for external storage, backup, networking and digital video. ??The DUB-C2 is compatible with USB 2.0 standards and 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 DUB-C2 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. The DUB-C2 supports Plug-and-Play installation which makes the DUB-C2 easy to install.