Optelec Compact Go Instructions Manual page 6

LED Light
Intensity of Contrast
1.1 LED Lights
Press THE MENU key TO OPEN the main menu, select the light icon, press
the color mode key once to open the light, and press the light again to close it
1.2 Screen Brightness
Choose this option to adjust the screen brightness. In Screen Brightness
setting, press Zoom in/out buttons to change the screen brightness, and
press the Mode button to confirm.
Intensity of Contrast
The crispness of text in high contrast color mode can be affected by the
lighting conditions and the reading material itself. This product enables you to
change the intensity of contrast color to ensure the best reading experience.
In the Intensity of Contrast setting, press Zoom in/out buttons to change the
intensity, and press the Mode button to confirm.
1.3 Reading Line or Masks
In the Reading line or Masks setting, press the Zoom in/out button to cycle
Screen Brightness
Intensity of Contrast
Gallery
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Reading Line or Masks
System settings