The pocket wizard ac3 zonecontroller allows you to control your flash set up directly from your cameras position simply add it to your on camera minitt1transmitter or flextt5 transceiver and you instantly have three zones of flash control whether working in e ttl ii or manual model put your flashes wherever you want without worrying about having to access them during a shoot with the ac3 zonecontroller you are in total control of your flashthree clearly labeled dials allow you to increa