Juniper Allegro 2 Owner's Manual page 26

Move the Display slider up to brighten the backlight or
down to dim it.
Dimming the Display Automatically
The display has a minimum brightness setting that it dims
to when the Allegro 2 is idle for the time interval indicated.
The display backlight dims by 50% or more, so the display
is still partially visible. You can adjust the dim time interval
(see the previous Battery Power screen) for battery and/
or external power. Dimming the display backlight saves
battery power.
To bring the backlight back up to the full brightness setting,
tap on the dimmed display.
Note: The Allegro 2 can be set up in subdued lighting
(tactical) mode. Refer to Chapter 3 for instructions.
Turning the Screen Off Automatically
You can set up the display backlight to turn off after set
intervals. Tap on the top title bar from any screen, and
select the battery icon from the list of applications that
appears.
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Allegro 2 Rugged Handheld Owner's Manual