Yongnuo YN-500Ex YN500Ex High-speed sync HSS Flash Speedlite/Speedlight The Yongnuo YN500EX Speed Light is the brand new range of speedlites which supports high-speed SYNC flash, TTL functions and remote wireless trigger. Compatible with N's and C's wireless flashing system. Motor zooming and PC synchronous interface. Large size LCD display, multiple trigger mode. Fast current-return functions never let you down.