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output devices 
Electronic devices used to view or print the results of data processing done on a computer.
video monitor
Device with a cathode ray surface that displays computer-generated graphics and texts visually.
centering control
Button that adjusts the position of the image on the screen.
horizontal control
Button that adjusts the width of the image.
vertical control
Button that adjusts the height of the image.
power switch
Mechanical device that turns the monitor on or off.
brightness control
Button that increases or decreases the contrast between the light and dark parts of an image.
power indicator
Signal light indicating that the screen is on.
contrast control
Button that adjusts the black and white part of an image.
