This kit includes 2 FlexTT5 Transceivers for Canon, an AC3 ZoneController, and a G Wiz Trunk to keep everything together. Use one FlexTT5 on your camera with the AC3 and a FlexTT5 with your Canon Speedlite. You instantly have the ability to control your remote flash in either manual or TTL mode. Just turn the dial on the AC3 to increase or decrease power levels, right from your camera’s position. You can also shoot seamlessly up to 1/8000 in manual or TTL mode. If you have White Lightning or AlienBees strobes, add in the AC9 AlienBees Adapter and control the power of your strobe directly from the AC3. No more walking over, climbing up a ladder, or hiring an assistant to slide the lever by hand! IMPORTANT NOTE: The FlexTT5 is TTL compatible with older Canon cameras, up to approximately early 2016. Newer generation cameras, starting with the 5D Mark IV and 1DX Mark II, require a FlexTT6 to be used as the transmitting radio for TTL communication. The FlexTT5s can be also used with current cameras in Basic Trigger mode for manual shooting, up to X-sync. Please see our Wiki page for details about compatibility. Do you have a newer camera body and need to use a FlexTT6 as your transmitting radio? This kit is an excellent option, as you can use the FlexTT5 units with your transmitting FlexTT6 for TTL, Power Control, and HSS. Whether you are adding to your PocketWizard system or just starting out, the FlexTT5 Bonus Bundle is an incredible value for Canon photographers.