6. Button descriptionButton DescriptionSOURCESelect one of the different input signals: VGA HDMI AHD/TVI/CVI CVBSOpen/Choice in the OSD menuMENU Show the OSD (on-screen display) Back/End a menu in the OSD Decrease the volume during operation Decrease the value in the OSD Confirmation of the input-signal Increase the volume during operation Increase the volume during operation Conformation of the input signal In the menu: switch between main menu items In the menu: switch between main menu items Switches monitor on or off