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 Supports Wireless Slave Function, fully supports YN560-TX, RF-603 II RF-602 Wireless Transmitter YN560 IV=YN560III+YN560-TX, Supports Wireless Master Function, Supports Multiple Trigger Synchronous Mode Supports setting save automatically, custom settings ( fn ) GN58@ISO100, 105mm ( M / MUlti mode ) Supports ultra-fast charging recycle system, External power supply