TRIVIEW THR15X Operating Instructions Manual page 26

INPUT SELECT：
Press – or + button to scrolling cursor up and down and then press
to select the input signal channel.
EXIT：Press MENU button to return to the MAIN MENU.
RESET：Press MENU button to reset all of adjustment to default value except
language，aspect ratio，audio control，display adjust and color temperature.
EXIT：Press MENU button to exit OSD menu.
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MENU button