Two Firewire IEEE 1394a port. Compliant with ExpressCard 34mm wide interface. Compliant with IEEE 1394-1955 and 1394a-2000 standard. Support transfer rate of 400/200/100Mbps. Support Windows 98SE/Me/2000/XP /Server 2003/XP 64-bit/Vista/MAC OS X. Come withProductIinInchesH