. 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 LED.
Neewer TT560 Flash Speedlite
Guide Number: 38 ( ISO 100)Light Quantity Output Control: with 1/8 - stop increment.
Color Temperature: 5600K
Flash Duration: 1/300s~1/20000s
Power: 4 x AAsize batteries ( Alkaline or Ni-MH are usable). Note: Battery is Not Included.
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