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YONGNUO YN560 IV Wireless Flash Speedlite, Master + Slave Flash + Built-in Trigger System, for Canon Nikon Pentax Olympus Fujifilm Panasonic Digital CamerasYN-560 IV Flash Speedlight is a combination of YN-560 III and YN560-TX it has built-in wireless trigger system, so you can not only use it as flash speed lite, but also a flash controller Transm..