Yongnuo 2 x YN560IV Flash Speedlite +Yongnuo 1 x YN560TX LCD Wireless Flash Controller For Canon DSLR Camera YONGNUO yn560IV the upgrade of YN-560III flash speedlite. YN560IV equal a YN560III plus a YN-560TX flash controller. YONGNUO YN560IV Supports Wireless Master and slave Function.High Guide Number 2.4G wireless speedlite, supports M/Multi/-- mode One YN560 IV can respectively receive the wireless signal from YN560 IVYN560-TXRF-603 (I/II)RF-602,with optional 16 channels. The YN560-TX will support all the major functions of the remote YN-560 III flashes in up to 6 individual Groups When YN-560 IV and YN-560 TX used as transmitter,it can realize remote control and parameter settings.