Yongnuo YN600EX-RT II HSS 18000s Master TTL Flash Speedlite For Canon 1. In optical transmission and radio transmission flash photography, YN600EX-RT II can be used as the master unit to control flash mode, exposure compensation, flash ratio, strobe times and strobe frequency. 2. Wireless transmission flash shooting, with YN600EX-RT (II), for Canon 600EX (II-RT430EXIII), a YN600EX-RT II can be used as a set-top box master or remote control slave, a total of 15 channels to choose from, to achieve TTL , manual flash and strobe. 3. In optical transmission flash shooting, YN600EX-RT II can be used as the master to trigger Yongnuo and for Canon EX series flashes (except YN585EX), support 4 channels, realize wireless TTL, manual flash and strobe. 4. One YN600EX-RT II can receive wireless signals from the host YN600EX-RT II, ??YN568EX II, 600EX(II)-RT, 580EX II, SB-910900800700, for Nikon built-in flash C command and Canon 7D60D600D camera has built-in flash wireless signal to realize wireless TTL, manual flash and strobe. 5. YN600EX-RT II, ??as a professional creative high derivative flash, supports TTL, M, Multi flash. 6. YN600EX-RT II can realize TTL, manual flash, and the maximum shutter synchronization speed can reach 18000. 7. Ultra-fast charging and recycling system, support external power supply 8. YN600EX-RT II is equipped with USB interface, supports firmware upgrade 9. Support automanual zoom: support auto and manual zoom, flash coverage can be switched between AUTO, 20~200mm. 10. Supports multiple trigger modes: YN600EX-RT II can be triggered by camera top trigger, PC synchronous trigger, wireless opticalradio remote trigger. 11. Auto save settings, support custom settings (Fn) 12. Equipped with large-size LCD screen, standard PC synchronization interface Specification: 1. Circuit Design: Insulated Gate Bipolar Transistor (IGBT) 2. Guide number: 60 (ISO 100, 105mm) 3. Flash mode: TTL, M, Multi, GR 4. Trigger mode: camera setting, wireless master mode, wireless slav