Supports C-Optical transport wireless flash master: 
In optical transport wireless flash capture, the YN568EX III can be used as a master unit to shoot YONGNUO and C series EX Speedlite (except the YN585EX), and supports 4 channels , performs wireless TTL, manual flash and strobe flash. 
Compatible with the optical wireless transport flash slave of C and N: 
One YN568EX III can respectively accept the master unit of YN600EX-RT II, ​​YN568EX II, YN568EX III, 600EX (II) -RT, 580EX II, SB-910/900 / 800/700, Nikon internal flash and for Canon commander and 7D / 60D / 600D wireless signal, performs external TTL, manual flash and strobe flash. 
GN58 @ ISO100, 105 mm, and supports automatic and manual zoom (24-105 mm):
TTL flash of high index, compatible with TTL, M, multiple flash; and it supports automatic and manual approach supports, the focal length can vary between 24-105 mm. 
Supports high speed synchronization flash (HSS) and high speed recycling system (2s): 
The YN568EX III can synchronize with all shutter speeds, perform TTL and manual flash, 1 / 8000s maximum shutter sync; and the recycling time for a complete exit only takes 2 seconds. 
Multiple activation modes, configuration of automatic settings and compatible custom settings: 
The YN568EX III can be activated by the camera decoder, the PC sync trigger and the wireless optical trigger outside the camera.
Support firmware update: 
The YN568EX III is equipped with USB interface, you can download the latest firmware from the official YONGNUO website to update the Speedlite. 
Equipped with large LCD screen and a 2.5mm PC interface, and is compatible with the real-time display screen of remaining battery power, convenient to use. 

Budget:

Circuit design: Insulated gate bipolar transistor (IGBT) 
Guide #: 58 (ISO 100, 105 mm) 
Flash mode: TTL, M, Multi 
Shooting mode: in the camera, Sc, Sn, S1, S2 
Zoom range: 24, 28, 35, 50, 70, 80, 105 mm 
Vertical rotation angle: -7 ~ 90 degrees 
Horizontal rotation angle: 0 ~ 270 degrees
Power supply: 4 AA batteries (not included, alkaline or NI-MH can be used) 
Lighting times: 100 ~ 1500 times (with AA alkaline battery) 
Recycling time: Approx. 2s (with new AA alkaline battery) 
Color temperature: 5600k 
Flash time: 1 / 200s ~ 1 / 20000s 
Flash control: 8 levels of output control (1/128 ~ 1/1), 29 fine adjustment levels in Total 
External interface: Hot shoe, PC port, USB port 
Wireless activation distance: 20 ~ 25m inside, 10 ~ 15m outdoor
Additional features: master flash, high-speed sync, rear curtain sync, FEC, FEB, FE lock, electric flash head zoom, sound notification, automatic save settings, PC synchronization, USB port, saving mode of energy, protection against overheating, advanced configuration of options. 
Item size: 6.2 x 7.2 x 18.8cm / 2.4 x 2.8 x 7.4in (extended state) 
Item weight: 383g / 13.5oz 
Package size: 21.5 x 9.5 x 8 cm / 8.5 x 3.7 x 3.1in 
Package weight: 565g / 1.2lbs 

Compatible with:

TTL shoe mode:
For Nikon D7500 D7500 D5000 D5000 D5000 D5000 D30000 D5000 D7500 D7500 D7500 D810 D7510 D300 D300 D300 D300 D200 D200 D80 D80 D90 D40 D40 D40x D60 D4 D3. 
Wirelss TTL slave mode: 
For Nikon Commander SU-800 
For Nikon SB-910, SB-900, SB-800, SB-700, Commander SU-800 
Camera with CLS i-TTL system: 
D4, D3x, D3s, D3, D2x, D700, D300, D300, D200, D7000, D90, D80 
For Canon 7D 6D 600D 650D 
For Canon Flash 580EX II 
For Canon ST-E2 Commander Package Included : 1 x YN568EX III Speedlite 1 x Mini Stand 1 x Protection Bag 1 x User's manual (English and Chinese)