Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 62)

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Operating the monitor
If either USB Type-C, DisplayPort, or HDMI input is selected and the corresponding
cable is not connected, the following message will appear:
NOTE: The message may be slightly different according to the
connected input signal.
When the monitor is under DP/HDMI input and a USB Type-C cable is connected to
a notebook that supports DP Alternate Mode, if
Auto Select for USB-C is enabled,
the following message appears:
You will see the following message before the Lock function is activated:
NOTE: The message may be slightly different according to the selected
settings.