Yongnuo YN560-TX Wireless Flash Controller With 1pc YN-560 III Flash Speedlite for Canon EOS 700D 650D 600D 550D 500D 450D 400D 350D 300D 1DIV 1DIII 5D 5DII 5DIII 1D 1Ds 7D Remote Manual Power Control and Zoom Head Control 6 Groups,16 Channels,Remote Multi (Stroboscopic) Setting,Large Clear LCD Screen Fast Setting Interface,2,4GHz 100M Range Compatible with RF-602/RF-603/RF-603II,Supports RF-603 /RF-603 II Wireless Shutter Release With YN560 III flashes it offers its amazing flash power and zoom setting. This means, one can set YN-560 III flash output and zoom by group directly by the controllers big LCD. No more walking around to each flash, which is often not possible if the flash is on a high light stand or in a softbox.