The Dynalite Uni400JR is a unique 400 watt/second AC/DC monolight. It provides up to 400 w/s when AC powered, is hardly bigger than a regular Dyna-Lite flash head, and weighs just 3.5 lbs.When combined with the optional Dynalite Jackrabbit II Battery Pack, the Uni 400 is a true location lighting source, providing up to 140 full power (320 watt/seconds) pops.Full, 1/2, 1/4, and 1/8 power settings in 1/3 stop steps provide a 4 f/stop range. Various kits are available -- type in: DYU400JR in the main search window, to see them.