PRODUCT INFORMATION:Pocket Wizard AC3 Zone Controller Canon\nThe AC3 ZoneController is the gem of the ControlTL product line. Add it to your on-camera MiniTT1 Transmitter or FlexTT5 Transceiver and you instantly have three zones of flash control. Whether working in TTL or Manual mode, you can control your remote flashes directly from the camera position. Available for both Nikon and Canon.ControlTL\u2122\nPocketWizard\u2019s new firmware platform taps into the full potential of your camera and flash system enabling an entirely new level of remote flash capability through our proven radio communications. ControlTL firmware is configurable and upgradeable for \u201Cfuture-proof\u201D continuous improvement.E-TTL II and CLS/i-TTL Compatibility\nDesigned to work seamlessly with Canon\u2019s E-TTL II and Nikon's CLS/i-TTL systems, the AC3 ZoneController removes operating complexity with its easy-to-use design.Manual Power Control\nWith three simple dials, you can quickly adjust the power .