YONGNUO--professional and creative YN600EX-RT II speedlite Realize the function of wireless optical and radio flash control In optical transmission and wireless radio transmission, the YN600EX-RT II can be used as the main unit to control the flash mode, the exposure compensation, flash ratio, number of stroboscopic and strobe frequencies. Compatible with Canon RT wireless radio system In wireless radio transmission flash shooting, cooperate with the YN600EX-RT(II)Canon 600EX(II-RT/430EXIII), a YN600EX-RT II can be used as a unit decoder master or remote slave unit, total 15 channels for option, realize TTL, manual flash and stroboscopic flash.Support Canon optical transmission wireless master flash In optical transmission flash shooting, the YN600EX -RT II can be used as the main unit to trigger YONGNUO and Canon EX series flash (excluding YN585EX), supports 4 channels, realizes wireless TTL, manual flash and stroboscopic flash. Canon and Nikon optical transmission wireless slave flash.YN600EX-RT II as a professional creative high guide number speedlite, supports TTL, M, Multi flash.. Supports high-speed synchronization The YN600EX-RT II can realize TTL, manual flash, the highest shutter synchronous speed is up to 1/8000. Ultra-fast charging recycling system, supports external power It only takes 2 seconds to full output. Even if you don't use the new batteries, recycling just takes 3-4 seconds super-fast time; Besides, you can also use the external power supply to meet your higher demands. Support Firmware Upgrade The YN600EX-RT II equipped with USB interface, support firmware upgrade, you can download the upgrade firmware through Yongnuo official website to upgrade the flash. Support auto/manual zoom Support auto and manual zoom, flash coverage can be changed between auto, 20~200mm. Multiple Triggering Mode Supported The YN600EX-RT II can be triggered by camera decoder, PC synchronous trigger, wireless optical/radio remote trigger. Auto-save settings, supports custom settings (Fn) Equipped with large size LCD display, Standard PC synchronous interface Specifications: Circuit Design Insulated Gate Bipolar Transistor (IGBT) Guide No. 60 meters (ISO 100, 200mm) Flash mode hss TTL M MULTI GR Trigger-top mode, wireless master mode, wireless slave mode, Sc, Sn, S1, S2 Wireless trigger distance 20~25m indoor, 10~15m outdoor Zoom range 20 , 24, 28, 35, 50, 70, 80, 105, 135, 200mm Vertical rotation angle -7~90 degrees Horizontal rotation angle 0~360 degrees Power supply 4 aasize batteries (Alkaline or Ni-MH are usable) Lighting time 100 ~ 1500 times (AA alkaline battery used) Recycle time about 3s (AA alkaline battery used) Color temperature5600k Flash duration 1/200s ~ 1/20000s Flash control 8 levels of output control (1 /128 ~ 1/1), 29 levels of fine adjustment External interface shoe, p ort PC Additional Features Master Flash, High Speed Sync, Second Curtain Sync, FEC, Feb, FEV, Manual Zoom, Auto Zoom, Sound Prompt, Advanced Setting, Auto Record Setting, PC Port, Power Saving Mode and overheat protection Dimensions 62 78 214mm (extended state) Net weight430g Package Contents: 1 X YN600EX-RT II Flash Speedlite 1 X Protective bag 1 X Mini stand 1 X English and Chinese manual Gift = 2