Samsung LS20HABKBQ-XAA - Manual (Page 13)

Kensington Lock : 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 : Remve the fixing pin on the stand to lift the
monitor up and down.
Cable Fix Ring:
When connecting the cable is finished
fix the cables to the Cable Fix Ring.
See Connecting the Monitor for further information regarding cable connections.