The ecusb3s22 2 port expresscard usb 30 card adds 2 superspeed usb 30 ports to an expresscard enabled computer system using a 34mm form factor that will fit in both 34mm and 54mm slots along with ports mounted side by side to provide room for easy access usb 30 supports data transfer rates up to 5 gbps 10x faster than usb 20 and is able to provide more power per port to help support faster and more powerful devices also this expresscard adapter is backward compatible with usb 201