Sennheiser SDC 3000 System Manual page 52

Structure of the central unit's operating menu
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the button that has to be used if you want to quit a menu item without
saving the setting(s)
the menu item to which the program returns after you have saved your
setting
the menu item to which the program returns if you discontinued your
entry
Settings which require additional explanation or must be made in
combination with other operating steps are described on the pages
following the menu tree.
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