Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 50)

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Setting Up the Monitor
Using the Tilt, Swivel, and Vertical Extension
NOTE: The following instructions are applicable only for attaching the
stand that was shipped with your monitor. If you are attaching a stand
that you purchased from any other source, follow the set up
instructions that were included with the stand.
Tilt, Swivel
With the stand attached to the monitor, you can tilt and swivel the monitor for the
most comfortable viewing angle.
NOTE: The stand is not installed at the factory when shipped.