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1. Tap > Settings
>
System > Backlight.
There are three tabs:
The options on the Battery Power tab and the External Power tab are same.
Battery
Power
Settings for the backlight to turn off when the terminal is using battery power.
External
Power
Settings for the backlight to turn off when the terminal is using external
power.
Brightness Settings for the backlight brightness when the terminal is using battery
power or external power.
Turn Off
Backlight
Choose this option to turn off the backlight automatically after a designated
period of time.
Turn On
Backlight
Choose this option for the backlight to turn on when a button or touch screen
is tapped with stylus or pressed with your finger.