Power pack has a seven f-stop range, from 3ws to 200ws. Dual off controls. Reaches full recycle in 1.3 seconds (x-tra fast mode). In fast mode, the recycle time is twice that, but with 30% more flashes per charge. Four-light battery gauge. Two symmetrical (Lumedyne style) head jacks. Uses a medium to large battery. Boostable to 2400ws. HSMs and AC ok 4.5 X 3 X 7.4? and 3.4 lbs.