PocketWizard MiniTT1 Transmitter and FlexTT5 Transceiver for Canon DSLR Bundle (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. ControlTL allows remote TTL for Canon E-TTL II systems as well as Manual Power Control Adjust the manual power settings of your remote Canon Speedlites directly from a 580EX II flash mounted on your on-camera MiniTT1 or FlexTT5. Power Tracking: When working in E-TTL II you can change any of your control settings on your flash or camera and the system adjusts for those changes. Optimized HSS: When HyperSync cant keep up, High Speed Sync takes over for Speedlite flash photography all the way to 1/8000. PocketWizard Compatible: The MiniTT1 operates on the same channels as all other PocketWizards and will work with any unit you may already have.