Featuring action freezing abilities of a 1/8000th second high-speed sync shutter speed, 20 framers per second burst speed, and minimum flash duration of 1/63000th second, the Profoto D2 is currently the world's fastest monolight with TTL.TTL functionality lets the Profoto D2 sync to your camera, and change flash settings to ensure that your subject is correctly exposed.This model of the Profoto D2 features a power output of 500W per second, a more powerful 1000W model is also available if needed.