Dell E2013H Monitor - Manual (Page 19)

Front panel button Description
A
Preset modes
Use the Preset modes button to choose from a list of preset color modes. See Using the OSD Menu .
B
Brightness / Contrast
Use the Brightness / Contrast button to direct access to the "Brightness" and "Contrast" control menu.
C
Menu
Use Menu button to open the on-screen display (OSD).
D
Exit
Use the Exit button to exit on-screen display (OSD) from menu and sub-menus.
Front panel button
Use the button on the front of the monitor to adjust the image settings.