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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 Cameras
YN560 IV=YN560III+YN560-TX, Supports Wireless Master Function.
Neewer TTL 2.4G Wireless Flash Trigger Transmitter (for Olympus)