Yongnuo YN560 III 2 PCS Flash Speedlite kit + YN560 TX Flash Controller for Canon DSLR Cameras 1.YN-560IIII Wireless Flash Speedlite Trigger Controller fits for Canon Nikon Olympus Pentax 2.One YN-560 III can receive the wireless signal from YN-560III,YN-560-TX,RF-603 II and RF-602 with optical 16 channels 3.When YN-560 III and YN-560 TX used as transmitter,it can realize remote control and parameter settings. 4.YN560TX can fire YONGNUO YN560III and YN560 IV flash speedlite when its is asleep. 5. YN560TX has two versions , this one is for Canon DSLR cameras.