The Profoto ProBallast 200/400 is a flicker-free power supply for both the ProDaylight 200 and ProDaylight 400 HMI heads. With its integral handle and sturdy design, the flexible ProBallast is meant to travel and you can use it anywhere there's electricity thanks to its self-sensing multi-voltage power supply. Even the output frequency is adjustable to 50 (Silent), 100 (Flicker-free) or 300 Hz (High Speed), while the power is dimmable from 100-50%. But there's more. Let's not forget that the "Air" in the name implies remote control and you can indeed control the light output wirelessly as well as power on and off from an optional Profoto Air Remote or Air Sync Transceiver. In fact, using Profoto's Studio software, you can create and control multiple lighting setups via computer.