The standard of rental studios worldwide, Profoto offers action-stopping short flash duration and fast recycling times for any type of application.Heavy-duty design, self seeking voltage, consistency of light output and color temperature, and compatibility with a full line of modular light shaping tools, make the Pro 7 power packs the first choice of photographers around the world.The Pro 7 system is a sound investment, since the accessories are also compatible with the lightweight Acute 2 and ComPact lines of electronic flash.The Pro 7S 1200 w/s power supply features turbo recycling, and ultra short flash duration.Other info:Capacitor RotationWhen one head is plugged into the power supply, the power supplying that head will alternate between two capacitors, allowing faster recycle times at minimum power and longer overall capacitor life. Six f-stop rangePower output can be dialed down 6 stops from 1200 to 37.5 w/s in 1/6 step increments. Turbo RecyclingTurbo recycling speed of .9 seconds at full 1200 w/s output. Recycling at minumum power (37.5 w/s) is a mere .1 second. Ultra Short Flash DurationAt Maximum output, the flash duration is 1/2200 sec. At Minimum output, it is 1/12,000 sec. Dual VoltageThe 7S features Self Seaking Auto Multi-voltage with AC voltages between 90 and 260V, 50 60 Hz.