The B1X the new version of the B1500is the ultimate solution when you need to work without having electrictity on set. It is small, lightweight and fits nearly all Profoto lightformers. The Battery lasts about 300 full power 500Ws flashes using the improoved MKII battery. The B1x features a brighter LED modling light than the B1. It comes with the convienient flat front glass. For some reflectors you can also use the dome style frontglass to get more acurate results. It features TTL and HSS (over full range in the B1X version) with the build in Air module. Be shure to have the TTL Remote fitting your camerasystem rented with this item.