Activates OSD, enters sub menu, selects items or confirms selection. Selects and adjusts Selects and adjusts (7) OSD Lock Out Function When monitor is in normal display, you can enable the “OSD Lock Out”function. Option 1: OSD lock - all 4 buttons are locked except the “POWER”button. Press and hold the ‘MENU’ and ‘◀’ buttons at the same time for 3 seconds to lock the buttons. The monitor will show an “OSD Lock Out” message for 5 ~ 10 seconds and the message will disappear automatically.