The Norman 810812 Battery Assembly is one of the most popular 400 w/s flash power supplies on today's wedding/location photography market. Its all-aluminum housing is rugged and compact. It can be worn either over-the-shoulder with the included shoulder strap, or around the waist. Delivering a guide number of 163 @ full power, the 400B can also be dialed down to 50 w/s.
The 812794 flash head (a.k.a. LH52KR-M) has a built-in, 32 channel Pocket Wizard radio slave transceiver, which allows firing of the head from your Pocket Wizard Plus Transmitter, or MultiMax transceiver. It also features a 50 watt modeling light, power cord, flashtube, and standard reflector. It is designed to fit onto any flash bracket, light stand or tripod by using its 1/4"-20 threaded socket on the bottom of the lamphead.