StudioMax III is a lightweight microprocessor controlled Monolight for studio or location work. The four models offer a wide range of standard features that includes discrete continuously variable power adjustments over a full 6 f-stop range. StudioMax III accepts all the Photogenic Quick-Change and StudioMax III accessories. Battery Powered StudioMax III model "B" units are the answer for photographers on-the-go. Lightweight units are available in 160 Ws. or 320 Ws. These two models can be powered by Photogenic's AKB-1 battery or by select models from other manufacturers (battery not included). A fully charged battery pack will usually provide 200 flashes for model AKC160B and 150 flashes for model AKC320B, at full power. When the lights are DC powered, the modeling circuit is disabled, conserving all your battery energy for flash. These versatile "B" models also operate on standard 110 volt power.