Buy from Amazon : http://www.amazon.com/gp/product/B00LD0K77M?tag=scratchandsti-20 <br /> <br />YONGNUO YN-622C-TX E-TTL Wireless Flash Controller for Canon <br /> <br />The distance is 100m with 7 channels and the Max Sync Speed reaches 18000S <br />Can support TTL Ratio USB Firmware Upgrade AF Assist Beam Emitter <br />It has 3Groups ABC and Sync mode 1st-curtain 2nd-curtain High-Speed SyncHSS <br />Flash mode GRE-TTLII manual Super SyncE-TTLIIMulti flash <br />Weight 82g and shutter release interface is 25MM Shutter release interface
