Microtek C783 User Manual page 13

Five OSD languages are supported for customer selection.
Display mode of 640 x 400 (graphic mode) or 720 x 400 (text mode) is
supported.
Three modes are provided: user mode, 6500, and 9300. User the & key
to move to the color temperature item, then press - & + to select the color
temperature setting. If the 6500 or 9300 values are set, the value cannot be
changed.
Use the & key to select the item, then press - & + to change the
brightness value.
Use the & key to select the item, then press - & + to turn the volume
down or up.
Use the & key to select the item, then press - & + to turn the mute
function on or off.
In the OSD screen, you will see the Horizontal frequency (HF), Vertical
frequency (VF), display resolution (MODE) and the monitor Firmware
version (ROM LEVEL). These settings are automatically detected by the
monitor and cannot be changed by the user.