YONGNUO YN560-TX II LCD Flash Trigger Remote Controller for Canon and YN560IV / III YN660 (with wake up function for Canon camera) YN560-TX II C, Manual Flash Controller triggers YN-560 IV YN660 YN560 III and the focal length setting of flash mode (flash output) remote control. No need to operate flash or flash. The display screen displays the parameters of the corresponding groups synchronized.