Lenovo ThinkVision E20-30 User Manual page 10

Display Control
Kensington anti-theft lock
1-3 Display User Guide
Different functions can be used through the key controls on the panel frame.
For information on how to use these key controls, see "Adjusting the Display
Image" on pages 2-3.
Your display is equipped with a Kensington anti-theft lock, which is located on
the back of the display.