This 2 port expresscard firewire adapter card adds two 1394b firewire ports to a laptop computer providing a cost effective way to add ieee 1394a and ieee 1394b firewire devices even if the laptop doesnt have a built in firewire 400 or firewire 800 port simply insert the ieee 1394b firewire 800 card ec1394b2 into an expresscard slot and youll be able to connect a broad range of firewire devices to your laptop while relying on data transfer speeds of up to 800mbps plus the card is backw