Display - Targa PNA-M4320T User Manual And Service Information

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You can also adjust the volume by using the buttons located on
the device housing (page 12, items 4 and 5).

Display

In this menu you can adjust the display brightness according to your needs.
For instance, in a bright environment it is convenient to increase the display
brightness.
You can also re-calibrate the display if you feel that the device doesn't
respond properly to the stylus input.
These settings will remain valid even after powering the device fully off.
From the Settings menu, tap the Display button.
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Navigation Device PNA-M4320T