Acer M200 User Manual page 31

Preferred MPX
If you are viewing an analog channel that supports multiple sound signals (e.g. NICAM,
Bilingual), you may set which signal is used.
Preferred subtitle language
If multiple subtitles are available, the TV will display the language selected in this option,
if it is available.
When watching TV, press the SUBTITLE key to see a list of available subtitles.
CI information
This setting shows information about the CI interface, if a CI card is being used.
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