Pocket Wizard Zonecontroller For Canonor FlexTT5™ Transceiver and you instantly have three zones of flash control. Whether working in E-TTL II or Manual mode, you now have control over all your flashes directly from the camera’s position. Put your flashes wherever you want, without worrying about having to access them during a shoot. With theAC3 ZoneController, you are in total control of your flash.Three clearly labeled dials allow you to 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