Optical and radio transmission integrated, use the Master and Slave units at will------YONGNUO Professional Creative Speedlite YN600EX-RT II. It is directly compatible for Canon's RT built-in TTL radio flash system, and also compatible for Canon 600EX-RT flash.

Features:
--Realize wireless optical and radio flash control function
In optical transmission and wireless radio transmission flash shooting, the YN600EX-RT II can used as master unit to control the flash mode, exposure compensation, flash ratio, number of stroboscopic and stroboscopic frequency.
--Compatible for Canon wireless radio RT system
In wireless radio transmission flash shooting, cooperate with the YN600EX-RT (II)、Can0n 600EX II-RT/ 430EXIII, one YN600EX-RT II can used as set-top master unit or remote slave unit, totally 15 channels for option, realize TTL, manual flash and stroboscopic flash.
--Supports for Canon optical transmission wireless master flash
In the optical transmission flash shooting, the YN600EX-RT II can be used as master unit to trigger the YONGNUO and Can0n EX series flash (excluding the YN585EX), supports 4 channels, realize wireless TTL, manual flash and stroboscopic flash.
--Supports for Canon and for Nikon optical transmission wireless slave flash
One YN600EX-RT II can respectively receive the wireless signal of master unit YN600EX-RT II、YN568EX II、600EX(II)-RT、580EX II、SB-910/ 900/ 800/ 700, for Nikon built-in flash C command and for Canon 7D/60D/600D cameras built-in flash wireless signal, realize wireless TTL, manual flash and stroboscopic flash.
--GN60 @ISO100, 200mm
YN600EX-RT II as professional creative high guide number speedlite, supports TTL、 M、 Multi flash.
--Supports high-speed sync
The YN600EX-RT II can realize TTL, manual flash, the highest shutter synchronous speed is up to 1/8000s.
--Ultrafast charging recycle system, supports external power supply
It just takes 2 seconds at full output. Even if not use the brand new batteries, it just takes 3~4 seconds ultra-fast time to recycle; Besides, you can also use the external power supply to meet your higher requirement.
--Support firmware upgrade
The YN600EX-RT II equipped with USB interface, supporting firmware upgrade, you can download the upgrade firmware through the Yongnuo official website to upgrade the flash.
--Support auto and manual zooming
Support auto and manual zooming, the flash coverage can be changed between AUTO, 20~200mm.
--Multiple trigger mode supported
The YN600EX-RT II can be triggered by the camera set-top, PC synchronous trigger, wireless optical/ radio remote trigger.
--Settings save automatically, support custom settings (Fn)
--Equipped with big size LCD display screen, standard PC synchronous interface

Driver & Software: [link removed by eBay]
Firmware: [link removed by eBay]

Specifications:
Brand: YONGNUO
Model: YN600EX EX-RT II
Circuit Design: Insulated Gate Bipolar Transistor (IGBT)
Guide No.: 60 (ISO 100, 200mm)
Flash Mode: TTL, M, Multi,GR
Trigger Mode: Set-up, wireless master mode, wireless slave mode, wireless optical master, wireless optical slave (Sc, Sn, S1, S2)
Zoom Range: 20, 24, 28, 35, 50, 70, 80, 105,135, 200mm
Vertical Rotation Angle: -7~90 degrees
Horizontal Rotation Angle: 180 degrees each side
Power Supply: 4* AA size batteries (not included)
Lighting Times: 100~1500 times (AA alkaline cell used)
Recycle Time: Approx. 3s (AA alkaline cell used)
Color Temperature: 5600k
Flash Time: 1/200s~1/20000s
Flash Control: 8 levels of output control (1/128~1/1), 22 levels of fine tuning
External Interface: hot shoe, PC port, USB port
Wireless Triggering Distance: Up to 100m
Optical Transmission Triggering Distance: 20~25m indoor, 10~15m outdoor
Additional Features: Master flash, off-camera flash, high-speed sync, second-curtain sync, FEC, FEB, FEV, the electronic flash head zooming, sound prompt, automatically saving setting, PC port, power saving mode, over heat protection, custom function, firmware update
Item Size: 6.2 * 7.8 * 20.5cm / 2.4 * 3.1 * 8.1in
Item Weight: 426g / 15oz
Package Size: 22 * 10 * 9.4cm / 8.7 * 3.9 * 3.7in
Package Weight: 638g / 22.5oz

Package List:
1 * Speedlite
1 * Mini Stand
1 * Protecting Bag
1 * User Manual (English & Chinese)

Note:
Batteries are not included.