The Dynalite Twinkle Studio Strobe Kit includes 2- 400 watt/second fan-cooled monolights with reflectors, tilt brackets, sync and 120 volt AC power cords. It is very lightweight, and perfect for location shooting as well as studio use. The light stands rise to a maximum height of 6.5 feet, and the entire kit fits into the included soft padded case.The variator dial clicks from full to 1/32 power, in 1/2 EV increments. The 200 watt modeling light offers 3-way switching: full, half, and off. The built in optical slave may be switched off, as well as the audible flash confirmation beep.The light stands in this kit each have a 3/8" threaded top to allow mounting of each monolight. The Twinkle requires a Rapid Stand Adapter with a 3/8" threaded top, if it is being used on top of a light stand with a standard Baby Stud top.