ViewSonic VX500+ User Manual page 14

Control Explanation
enables a sound to be made when you touch a
Touch Tone
button on the Front Control Panel.
returns adjustments to the original factory
Memory Recall
settings if the display is operating in a factory Preset Timing
Mode listed in this user guide.
Exception: This control does not affect changes made with the
User Color control.
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ViewSonic VX500+