B007NZ9XGM Hahnel Tuff TTL Wireless Flash Trigger for Canon Digital SLR Cameras

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Compatible with Canon E-TTL / E-TTL II 2.4 GHz Frequency Range: 656′
Digital Channel Matching High Speed Sync Works with Flash Exposure Compensation Removable Silicone Casings
Mini-USB Port for Power & Updates Each Unit Runs on 2 AA Batteries Receiver has 1/4″-20 Thread on Base