Itronix T5200 User Manual page 18

You can toggle the backlight on if you need additional light to view
the screen. To conserve battery power, the backlight is defaulted to
switch off automatically after one minute of continuous idle time.
You can also adjust the display contrast for better viewing.
Use the following keys to make adjustments:
Toggle the backlight on and off
Lighten the display
Darken the display
1 Tap the Start button, tap Settings, and then double-tap Control
Panel (or simply double-tap the time on the task bar and skip
Step 2).
2 Double-tap the "World Clock" icon.
3 From the Date & Time menu, make changes to the Time and
Date, and then close this screen by tapping OK in the upper
right-hand corner of the window
+A2
SHIFT
+A5
SHIFT
+A6
SHIFT
OK