Dell P2223HC 21.5" 16:9 IPS Monitor - Manual (Page 52)

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Operating the monitor
Input Source Selects between the different video signals that may
be connected to your monitor.
USB-C 65W
Select the USB-C 65W input when you are using
the USB Type-C connector. Press the joystick to
confirm the selection.
DP Select the DP input when you are using the
DisplayPort (DP) connector. Press the joystick to
confirm the selection.
HDMI Select the HDMI input when you are using the HDMI
connector. Press the joystick to confirm the
selection.
Auto Select Allows you to scan for available input sources. The
default is
On .