Samsung LS21BRBAB-XAA - Manual (Page 18)

Using (a) , you can rotate the screen within a range of 0 ~ 90 degrees.
Using (b) , you can use the screen lengthwise.
Press the top side of the stand and then push the button at the rear bottom of
the stand.
You can adjust the stand height using this button.
When you are using a stand height as maximum, it will go down a little bit from
spring elasticity.
If you rotate the screen without lifting it to its maximum height, the screen
may be damaged because the edge of the screen would hit the floor.
Tilt angle
Using (c) , you can adjust the height.
You can adjust the tilt within a range of 0 ~ 25 degrees.
Using
(d) , you can horizontally rotate it within a range of -45 ~ 45 degrees.
Removing the base
1. Turn off your monitor and unplug its power cord.
2. Lay the LCD monitor face-down on a flat surface with a cushion beneath it to protect the
screen.
3. Remove four screws(A) and then remove the Stand from the LCD monitor.
Attaching a Base
This monitor accepts a 100 mm x 100 mm VESA-compliant mounting interface pad.