PocketWizard FlexTT5 for Canon

Combination Transmitter/Receiver High Speed Sync up to 1/8000th Sec. On-Camera Hot Shoe Triggers Flash or Camera 32 Channels, Multi-Zone Triggers All Pocket Wizards Standard Triggering with Most Cameras USB Upgradeable

The PocketWizard FlexTT5 Transceiver Radio Slave is part of an ultra-versatile radio slave system, and is dedicated specifically to the Canon E-TTL II flash control system. It simply slides directly into the camera's hot shoe, and there are no special settings to make or modes to call up. Use the camera, on-camera flash, or flash commander controls for flash compensation, zone and ratio control. It supports single or multiple dedicated flash units. The FlexTT5 is the ideal addition to most Canon E-TTL II flash system. Since this system works on digital radio technology, it can support E-TTL operation around corners, out-of-sight, or in bright sunlight.