Audiovox LCM5N - Manual (Page 7)

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* If you use the built-in monitor loudspeaker, leave
the volume level in the OSD menu on the middle
setting. Adjust the volume level for the audible
messages of the navigation system with the + or –
buttons on the remote control.
* The volume level of the built in monitor speaker can
also be set without invoking the OSD menu. Press the +
or – button on the monitor. The display automatically
changes to the menu for setting the volume. Set the
volume desired by pressing the + or – buttons.
Set up Menu
The monitor offers you the possibility of performing the following
settings in the Setup Menu:
* Brightness Control: Day/Night
* Loudspeaker: On/Off