How brightness change acer laptop without function key

i have acer aspire4739Z lap.the fn+Arrow does not work to adjust screen brightness.is there any possible options to adjust brightness without function with arrow key?
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More about brightness change acer laptop function
  1. Control Panel > Power Options

    Use the slider at the bottom of the window to adjust screen brightness.
  2. in my lap,there is no slider at the bottom of power option.
  3. in my lap,there is no slider at the bottom of power option.
    what can i do?any other options possible to solve this problem?
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