Eclipse AVN4400 Owner's Manual - page 125
Manual is about: DVD-Video/USB Multi-Source receiver/4.3" Portable Navigation/ Built-in Bluetooth wireless technology
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Hidden buttons and features
When you first start using your TomTom, not all the buttons will be shown in
the menu.
Many buttons and some more advanced features are hidden because you will
not need these features very often.
To show all buttons and features, tap Show ALL menu options in the
Preferences menu.
To hide these buttons again, tap Show fewer menu options in the Preferences
menu.