Yongnuo YN-568EX II, YN568EX II Flash, High speed, Ultra powerful GN master control, Off camera speedlite for Canon Support HSS (the High Speed Sync) up to 1/8000 second This YN-568EX II can be used as a Master flash Supports for Canon's System and Supports Auto/Manual Zooming Comprehensively Support TTL Functions and Sound Prompting System Advanced Settings On Flash and Automatic Setting Saving