The MiniTT1 Transmitter is easy to use, just slide in place and begin to shoot. The PocketWizard Control TL System interprets the complex CLS / i-TTL data being sent through the camera's hot shoe and digitally transmits it in a reliable radio signal. Change the exposure compensation dial on the camera, and those commands pass seamlessly through the system to your remote flash. Add the PocketWizard AC3 ZoneController to easily adjust up to three zones of light independently, in both i-TTL or manual. PocketWizard Control TL radio communication allows you to shoot farther, faster, around corners, through walls even at high noon in bright daylight.