Add two USB 2.0 ports to a computer through an ExpressCard slotThis USB ExpressCard lets you add two USB 2.0 ports to your laptop computer, with support for high-speed USB transfer rates of up to 480Mbps. Compliant with the ExpressCard Type II standard, the USB ExpressCard can be installed in any 34mm or 54mm ExpressCard slot, and offers broad operating system compatibility supporting Windows 2000/XP/XP 64-bit/Server 2003/Vista.The StarTech.com Advantage- Easily add two USB 2.0 ports to your laptop computer- Hot swap capabilities allow you to connect and disconnect devices without turning off your computer- PC and Mac compatible