Sony HVL F28RM External Flash with Wireless Radio Control UOWD INZONE Up to approximately two times linkbuds Up to approximately two times faster16 AF speed and two times more precise13 AF tracking performance let you capture and maintain focus on nimble wildlife in unpredictable motion Cutting edge image innovation includes Sony’s unique Deep Black Non Glare Premium for enhanced contrast and reduced reflections ) More than 110 times(Alkaline battery) More than 130 times(Ni MH battery) 8 CONTINUOUS FLASH PERFORMANCE 40 flashes at 10 flashes per second 9 POWER SOURCE Two AA size alkaline or Ni MH batteries It can be controlled directly from the camera and is small enough to fit in a pocket while offering professional durability as well as wireless radio communication for a wide range of applications