YONGNUO YN 560 Speedlite flash

Features:
*Supports Wireless Master Function:
The YN560 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 the YN560 IV and YN560 III.
*Supports Wireless Slave Function, fully supports YN560-TX, RF-603(I/II), RF-602 Wireless transmitter:
One YN560 IV can respectively receive the wireless signal from YN560 IV, YN560-TX, RF-603 (I/II), RF-602 with optional 16 channels; when the YN560 IV and YN560-TX used as transmitter, it can realizeremote control the parameter settings.
*Multiple Trigger Synchronous Mode Supported:
The YN560 IV can triggered through the set top of the camera, 2.4G wireless triggering, S1 and S2 pre flash cancel mode.
*Settings Save Automatically, Supports Custom Settings (Fn):
The parameters on the flash will automatically save when the flash turned off; the users can customize setting the flash function as needed.
*GN58 @ ISO100, 105mm:
High Guide Number 2.4G wireless speedlite, supports M/Multi/--mode.
*Sound Prompting System:
When the sound prompting system is enabled, the different sound ways will prompt different operating state of the flash so as to allow you focus on shooting.
*Support Electric Zooming Function:
The flash coverage can be altered between 24~105mm through the [ZOOM] button.
*Ultrafast Charging Recycle System, Supports External Power Supply.
*Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface.