HP Compaq S2021 20-inch Widescreen LCD Monitor - Manual (Page 23)

The "Minus" (-) and "Plus" (+)OSD button function
The “Minus” and "Plus" OSD button shall be a hot-key for the Volume adjustment.
(select models)
Figure 4-5 Adjusting volume
The "OK/Auto" button function
Pressing the “OK/Auto” button will auto adjust the screen display.
Figure 4-4 Selecting input source
The "Menu" button function
Pressing the “Menu” button for more than 10 seconds shall be a hot-key to lock the
OSD function.
Figure 4-6 The OSD function has been locked
ENWW Front-bezel control buttons 17
Pressing the “OK/Auto” button for 5 seconds shall be a hot-key for the Input
Select (select models).
.
Figure 4-3 Auto Adjust