Specification: yn-560 iv flash speedlite 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 speedlite, but also a flash controller transmitter.
features:
a, tx master flash mode: when you set up yn-560iv as tx mode, it can be used as a flash controller transmitter, it can trigger yn-560 iv ( rx mode )and yn-560 iii ( rx mode ), and also can be used with rf-602, rf-603 ii, rf-605 together.
b, rx slave mode: when you set up yn-560iv as rx mode, you can use it with yn560-tx flash controller, and rf-602, rf-603 ii, rf-605 single transceiver.
c, manual mode
d, multi mode
e, s1 / s2 mode - you should use those two modes off camera
f, power saving mode g, overheating protection h, manually set and zooming position
g, pc synchronous port
suit for: all cameras with iso standard hot shoe. yongnuo rf-605, rf-603 ii, rf-602, yn-622c, yn-622n, yn560-tx yongnuo yn-560 iii yongnuo flash battery pack sf-17 c / sf-18 c