YONGNUO YN600EX-RT Auto TTL HSS Flash Speedlite YN600-EX-RT buit-in Radio Slave for Canon with 4 X EdisonBright Ni-MH Rechargeable AA Batteries Bundle for Canon Cameras Fully Compatible with YONGNUO YN-E3-RT,Canon's 600EX-RT/ST-E3-RT Wireless Signal Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface Ultrafast Charging Recycle System, Supports External Power Supply supports auto and manual zooming, the flash coverage can be changed between AUTO, 20-200mm This bundle includes 4 X EdisonBright Ni-MH rechargeable AA batteries