Targa PNA-M4320T User Manual And Service Information page 65

English
If you wish to have an acoustic warning as well as the displayed
warning when exceeding a speed limit, tap the checkbox next to the
"Warning tone" option also. An enabled setting will be shown by a
checkmark.
In order to output the warning only after exceeding a specific
tolerance above the speed limit, tap any of the default speed limit
buttons or tap "?" to enter a custom value.
Tap the confirmation button to confirm your settings:
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Navigation Device PNA-M4320T