Night Owl PRO-1681TB-2DMA user manual - Manual (Page 75)

Chapter 20: Maintenance Menu
75
Maintenance Menu
Use this menu to access the Basic Maintenance Settings and Settings
menus.
Be sure to Apply all changes made to the menus. If you do not
apply the changes, they will not be saved.
You can also select the
Default button on any page to restore the
DVR’s original settings.