The 1394-66-4.5 is an IEEE1394 Fire Wire 6 pin to 6 pin cable. It is used to connect your 6 pin 1394 peripherals (printer scanner storage devices etc) to your computer equipped with a 1394 port.
2 x 6 pin connectors
Fully moulded cable
Aluminum foil and braid on each twisted pair and overall cable
Conductors - (2) twisted pairs 28 AWG; (2) power 22 AWG
Supports data transfer rates of 100 200 & 400Mbps