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600ex-rt from Yongnuo is the top of the line speedlight available for Canon users. It features built in radio communication so that you can reliably use it off camera and maintain complete control. The 600ex-rt can be used as a master flash with other 600ex-rt's from both Canon and Yongnuo. It can be used as a slave off camera as well when controlled by another 600ex-rt or with the YN-E3-RT controller. This speedlight also has the ability to be made to be an optically triggered slave and a slave to the built in system in many Canon cameras (infrared). It features TTL capabilities, High Speed Sync, Rear Curtain Sync, Flash Exposure Bracketing, Flash Exposure Compensation and many other useful settings. This speedlight also can be used with an external battery pack if needed. An added feature of this speedlight, as with other TTL capable speedlights from Yongnuo is the ability to use this Canon version speedlight with the Nikon wireless system as well. If you want the best that there is to offer, this is it.
Supports RT System
One YN600EX-RT can be used as on-camera master unit and remote slave unit of Canon’s RT system,and supports Gr grouping mode.
Fully Compatible with YONGNUO YN-E3-RT,Canon’s 600EX-RT/ST-E3-RT Wireless Signal
One YN600EX-RT can be used as master unit to trigger YONGNUO YN600EX-RT,Canon’s 600EX-RT,and live display the flash groupings of slave unit and recycling information; One YN600EX-RT can ]respectively receive the wireless signal of master unit YN600EX-RT、YN-E3-RT、Canon’s 600EX-RT/ST-E3-RT, realizing remote TTL、M and Gr flash.
High Guide Number, Supports High-speed Sync
GN60@ISO100，200mm;supports high-speed sync TTL, manual flash, Gr grouping flash, the highest synchronous speed can reach 1/8000s
Supports USB Firmware Upgrade
The YN600EX-RT equipped with the USB interface, supports firmware upgrade, the users can download the upgrade firmware through the Yongnuo official website to upgrade the flash.
Supports Wireless Optical Slave function
The YN600EX-RT supports YONGNUO, Canon’s and Nikon’s wireless optical master signal, supports S1 and S2 pre flash cancel mode.
Support Auto/Manual Zooming
The YN600EX-RT supports auto and manual zooming, the flash coverage can be changed between AUTO, 20~200mm.
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.
Ultrafast Charging Recycle System, Supports External Power Supply
Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface
Here is a link to learn how to update the firmware.