ONGNUO Professional creative speedlite YN600EX-RT II 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 with Canon wireless radio RT system 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. Supports 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 Canon EX series flash (excluding the YN585EX),supports 4 channels, realize wireless TTL, manual flash and stroboscopic flash. The YN600EX-RT II can realize TTL, manual flash, the highest shutter synchronous speed is up to 1/8000. Ultrafast Charging Recycle System, Supports External Power Supply 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. Supports Firmware Upgrade 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. Support Auto/Manual Zooming Supports 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, Supports Custom Settings (Fn) Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface Specifications: Circuit designInsulated Gate Bipolar Transistor (IGBT) Guide No.60 meters (ISO 100, 200mm) Flash modeHSS TTL M MULTI GR Trigger ModeSet-top, wireless master mode, wireless slave mode, Sc, Sn, S1, S2 Wireless triggering distance20~25m indoor, 10~15m outdoor Zoom range20, 24, 28, 35, 50, 70, 80, 105, 135, 200mm Vertical rotation angle-7~90 degrees Horizontal rotation angle0~360 degrees Power supply4AAsize batteries (Alkaline or Ni-MH are usable) Lighting times100~1500 times (AA alkaline cell used) Recycle timeapprox 3s (AA alkaline cell used) Color temperature5600k Flash time1/200s~1/20000s Flash control8 levels of output control (1/128~1/1), 29 levels of fine tuning External interfacehot shoe, PC port Additional featuresMaster flash, High-Speed sync, Second-curtain sync, FEC, FEB, FEV, manual zoom, auto zoom, sound prompt, advanced setting, automatically saving setting, PC port, power saving mode and over heat protection Dimensions6278214mm (Extended state) Net weight430g Package Content: 1 X Flash Speedlite YN600EX-RT II 1 X Protector bag 1 X Mini stand 1 X Manual in English & Chinese