Features: Supports C:- Optical transport wireless main flash: -- In optical transport wireless flash shooting, the YN568EX III can be used as the main unit to trigger YONGNUO's EX series speedlite and C (except YN585EX), and supports 4 channels, realize wireless TTL, manual flash and stroboscopic flash. Compatible with C and N optical transport wireless slave flash: -- One YN568EX III can respectively accept the main unit of YN600EX-RT II, YN568EX II, YN568EX III, 600EX(II)-RT, 580EX II, SB -910/900/800/700, Nikon internal flash and Canon control and 7D/60D/600D wireless signal, realize external TTL, manual flash and stroboscopic flash. GN58 @ ISO100, 105mm, and supports auto and manual zoom (24-105mm): -- High-index TTL flash, supports TTL, M, multiple flash; And supports auto and manual zoom, the focal length can vary between 24-105mm. Supports high-speed sync flash (HSS) and with high-speed (2s) recycle system: -- YN568EX III can sync with all shutter speeds, realize TTL and manual flash, maximum sync shutter speed 1/8000s; And the recycling time for full output only takes 2 seconds. Multiple Trigger Modes, Parameter Auto Save and Custom Setting Supported: -- YN568EX III can be triggered by camera decoder, PC sync trigger and wireless optical trigger of camera. Support Firmware Upgrade: -- YN568EX III is equipped with USB interface, you can download the latest firmware from YONGNUO official website to upgrade the speedlite. Equipped with large size LCD screen and 2.5mm PC interface, and supports real-time remaining battery display, convenient to use. Specifications: Circuit Design: Insulated Gate Bipolar Transistor (IGBT) Guide #: 58 (ISO 100, 105mm) Flash Mode: TTL, M, Multi Trigger Mode: On Camera, Sc, Sn, S1, S2 Zoom Range : 24, 28, 35, 50, 70, 80, 105mm 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 time: 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 output control (1/128 ~ 1/1), 29 levels fine tuning at total External interface: hot shoe, PC port, USB port Wireless trigger distance: 20~25m indoors, 10~15m outdoors Additional features: main flash, high-speed sync, rear-curtain sync, FEC , FEB, FE lock, electric flash head zoom, sound prompt, auto save setting, PC sync, USB port, power saving mode, overheat protection, advanced option setting. Item size: 6.2*7.2*18.8cm/ 2.4*2.8*7.4in (extended state) Item weight: 383g/ 13.5oz Package size: 21.5*9.5*8cm / 8.5*3.7*3.1 in Package Weight: 565g/1.2lbs Package List: 1* Speedlite 1* Mini Stand 1* Protective Bag 1* User Manual (English and Chinese) 1* Gift