Yongnuo YN-560IV(560III upgrade version,a Combination of YN-560 III and YN560-TX all functions) 2.4G Wireless Flash Speedlite Trigger Controller for Canon Nikon Olympus Pentax+Coming with Free Smart&Cool &reg;brand product. Supports Wireless Slave Function, fully supports YN560-TX, RF-603(I/II), RF-602 Wireless transmitter: The YN560 IV can triggered through the set top of the camera, 2.4G wireless triggering, S1 and S2 pre flash cancel mode. The YN560 IV can be used as master unit, provides 3 independent groups with controlling ability, realizing remote control the flash mode, flash output and focal length of the YN560 IV and YN560 III. *Sound Prompting System Supports ultra-fast charging recycle system, External power supply