ViewSonic VPD400 User Manual page 32

Enjoy Life, Enjoy ViewSonic
Off screen timer: There are seven timer intervals that can be selected.
Output
The VPD400/VPD500 image can be viewed locally or output to an
external display.
Output options: Local display or external display. External output is
for external viewing. When the output option is set to External, the
player screen is turn off.
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ViewSonic VPD400/VPD500