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.

Functions:

1. Supports Wireless Master Function
   
   YN-560 IV can be used as master unit, provides 3 independent groups with controlling ability, realizing remote control the flash mode, flash output, and focal length of YN-560 IV and YN-560 III
    
2. Supports Wireless Slave Function, fully supports YN560-TX, RF-603 II RF-602 Wireless Transmitter
   
   One YN-560 IV can receive the wireless signal from YN560 IV, YN560-TX, RF-603 II and RF-602, with optical 16 channels.
   
   When YN-560 IV and YN560-TX used as transmitter, it can realize remote control and parameter settings.
    
3. Supports Multiple Trigger Synchronous Mode
   
   It can be triggered through the flash mounted on the camera, 2.4G wireless triggering system, S1 and S2 pre flash cancel mode.
    
4. Supports setting save automatically, custom settings ( fn )
   
   105mm ( M / MUlti mode )
    
5. Supports ultra-fast charging recycle system, External power supply.
    
6. Compatible with most Canon, Nikon, Sony, Pentax and Olympus cameras with standard hot-shoe mounts.

Features:

• 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.
   
• 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.
   
• Manual mode
   
• Multi mode
   
• S1 / S2 mode --- You should use those two modes off camera
   
• Power saving mode
   
• Overheating Protection
   
• Manually set and zooming position
   
• PC Synchronous Port