Acer H243H User Manual page 14

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Attaching the base (for selected models)
Note: Remove the monitor and monitor base from its packaging.
Carefully place the monitor face-down on a stable surface -- use a
cloth to avoid scratching the screen.
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1 Attach the the monitor stand arm to the base.
2 Ensure that the base is locked onto the monitor stand arm.
Note: Take care when performing the installation to avoid
injuring yourself.
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