Size: 6 Feet FireWire 800 (FireWire 1394b) is the new version of the popular FireWire interface which doubles the throughput of the original IEEE-1394a FireWire interface from 400Mbps to 800Mbps! "BETA" refers to the FireWire 800 9 pin connector which is called a "beta connector. " FireWire 400 connectors are called "alpha connectors.