These are somewhat older lights that fell between the Ultras and UltraZap. These do not have a remote jack (i.e. for the Cyber Commander or LG4X), only the sync jack for basic triggering (sync cord or basic triggering from CyberSync remotes). Also, repairs may be limited should you have any troubles.
These are 500Ws lights, and are closest to the B1600 in terms of maximum power and power variablity, though somewhat less powerful. All face plate accessories will fit.
Here is the manual for them:
http://www.paulcbuff.com/manuals/zap1000.pdf