This is a 180ws 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 180w. * 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.