Neewer 180 Watt Professional Photography Studio Strobe/Flash This is a brand new 18ws Flash Strobe (master strobe). It could be triggered by a flash,infrared and sync cord (included). It also comes with a test button and variable dial for power setting from 1/8 to full 18w. The Studio Light is providing you with a Continues Lamp and Flash Function. It will work as main light, back light or hair light and comes with an easy-to-use umbrella holder.