Samsung 275TPLUS - Manual (Page 18)

Kensington Lock
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The Kensington lock is a device used to physically fix the
system when using it in a public place.
(The locking device has to be purchased separately.)
For using a locking device, contact where you purchase it.
Stand Stopper
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Remove the fixing pin on the stand to lift the monitor up and
down.
See Connecting Cables for further information regarding cable connections.