Yongnuo YN-560IV YN560 IV Wireless Flash Speedlite Trigger Controller
for Canon Nikon Olympus Pentax
Compatible with : All cameras with ISO standard hot shoe .
YN560IV= YN560III + YN560TX
YN-560 IV Flash Speedlite is a combination of YN-560 III and YN560-TX, it has built-in trigger system, so you can not only use it as flash speedlite, but also a flash controller Transmitter.