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Expand your system with PCI Express Card AddOn's to work with Firewire, serial communication with RS-232 protocols, and ExpressCard to USB 3.0 options. ExpressCards slide into the 34mm slot of your laptop computer and are equipped to expand your capabilities in how data is transferred. They are portable and can be brought on business trips, or shared in the office. ExpressCards are offered various formats to accommodate your peripheral needs to be successful.