Samsung SyncMaster XL20 - Manual (Page 11)

Power Cord DVI Cable
USB Cable
(A-B Type cable)
Others
Calibrater Cradle Hood
Front
MODE button
(= Color Mode) Press this button to select a Color Mode. Continuing to press the
button, will repeatedly display the setting modes. With the control
buttons at the front of the monitor, you can easily implement
different color information matching your environment.