PocketWizard AC3 ZoneController for Canon - Black Only products shipped from and sold by authorized resellers such as Amazon.com can ensure that you are receiving product that has proper FCC communication and is covered by the US Warranty. E-TTL II Compatibility: Using PocketWizards ControlTL system, the AC3 is designed to work seamlessly with Canons E-TTL II system. Three Zone Control: Control up to three zones of light, each with one or more flashes, right from the cameras position. Wide range of control: With three simple dials, you can quickly adjust the power settings for three independent zones in clearly labeled 1/3 stop increments over a six stop range. Studio Flash Compatibility A FlexTT5 paired with an AC9 AlienBees Adapter, and White Lightning studio flash. Coming with AC9