Viltrox OC-E3 off Camera TTL cord can completely support Canon cameras and flash units fully compatible with Canon e TTL features.While one end of OC-E3 TTL cord is mounted to the hot shoe of the Canon cameras, the other end of OC-E3 TTL cord is mounted under the flash units with Canon TTL , most of the eTTL functions can be communicated via this TTL cord. OC-E3 is the perfect choice for portrait / product photography and special effect shooting. Type VILTROX Canon TTL cord Model OC-E3 hot shoe TTL cord Weight 102g Dimensions (W×H×D) 126×80×40mm Extended lenght 1.5m Included Items SC-29 ×1，Manual ×1 Compatible Camera / Flash Canon DSLR camera EOS7D/5D/5DII/5DIII/50D/40D/3G11/EOS1000D/550D/500D/450D/400D/ 350D/300D .etc Canon Flash 600EX,580EXII, 580EX, 430EXII, 430EX, 270EX, 220EX，VILTROX JY-680C .etc