Vivitek LCD-TV - Manual (Page 26)

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Caption preference
The Caption Preference sub-menu sets the default captioning mode. If set to Automatic,
the mode is determined by the broadcast.
Reset CC
Reset all Closed Caption sub-menu options to the factory defaults.
Sleep Timer
The Sleep Timer sub-menu initiates a timer that will automatically power off the LCD-TV
when the desired countdown value has been reached.