Profoto B1 makes it easier than ever to take the flash off your camera. With AirTTL you set the light in a flash, with no cables or cords, you can take the B1 with you wherever I go and put it wherever I want. Add 500 Watt heads, gives you power, speed and light shaping possibilities that Profoto lights are known for, and you have an off-camera flash that makes great light easy.