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. 

In wireless radio transmission flash shooting, cooperate with the YN600EX-RT（II）、

Canon 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. 

In the optical transmission flash shooting, the YN600EX-RT II can be used as master unit to trigger 

the YONGNUO and Canon EX series flash (excluding the YN585EX),supports 4 channels, 

realize wireless TTL, manual flash and stroboscopic 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,Nikon built-in flash C command and 

Canon 7D/60D/600D cameras built-in flash wireless signal, realize wireless TTL, manual flash 

and stroboscopic flash.  

It just take 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.

The YN600EX-RT II equipped with USB interface, supports firmware upgrade, you can download the upgrade

 firmware through the Yongnuo official website to upgrade the flash.

The YN600EX-RT II can be triggered by the camera set-top, PC synchronous trigger,

 wireless optical/radio remote trigger.