Edimax Technology WP-S1100 - Manual (Page 79)

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3-8 Black Out
When you don’t want audience see the content of your computer display
temporarily when you’re active presenter, you can suspend video output by
this function.
Click ‘Screen Off’ button and video will stop displaying on external display.
Click it again to resume.
Please note that this function will not stop video signal, therefore external
display will NOT enter power-save mode when you use this function to stop
displaying video contents (if it supports).