PocketWizard AC3 ZoneController for Canon DSLR

When you add the Pocket Wizard AC3 ZoneController for Canon to your on-camera MiniTT1 Transmitter or FlexTT5 Transceiver, you instantly have three zones of flash control. Whether in E-TTL II or Manual mode, you have control over all your flashes from your camera position. Put your flashes wherever you want, without worrying about having to access them during a shoot. 

Three clearly labeled dials let you increase or decrease power to three zones of flash in 1/3-stop increments--with a range of up to six stops. Three switches allow you to change zones between Manual, Auto (PowerTracking/E-TTL II) or OFF. Best of all, the design is simple to use, with an intuitive interface. When matched with the PowerST4 or AC9 AlienBees Adapter, you can now control ElinchromRX1, White Lightning2 and AlienBees2 flashes right from the camera's position.