NEEWER TT560 Camera Flash Speedlite 5500K with Standard Hot Shoe Mount Compatible with Canon Nikon Panasonic Olympus Pentax Fijifilm and Other Digital Cameras Note: TT560 flash Don't support TTL and the camera menu setting FunctionPower Management: Switch to the ON, the flash will start charging (the charging indicator is dim)For a test flash, press the test button. After use, press the ON/OFF to OFF to power off.Red charging indicator lamp flickers in every 1s; it indicates low battery; The flash unit has 8 steps of power output control which indicated by 8 pieces of LEDGuide Number: 38 ( ISO 100)Light Quantity Output Control: with 1/8 - stop increment.Color Temperature: 5500KFlash Duration: 1/300s~1/20000sPower: 4 x AAsize batteries ( Alkaline or Ni-MH are usable). Note: Battery is Not Included.