Planar Systems PXN2200 21.5" 16:9 IPS Monitor - Manual (Page 13)

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Option 2: OSD & Power button lock – all 5 buttons including the “POWER” button are locked.
Press and hold the 1 button and the button for 3 seconds to lock all 5 buttons.
The LED Monitor will show a “Lock Out” message for 3 seconds and the message will disappear
automatically.
Repeat this step to unlock.