Display · Menu 49
Auto backlight timer — how long the LCD stays lit after the last interaction.
MENU on the radio to open the menu.49: ABR.MENU again to enter the setting.MENU to save, or EXIT to cancel.Brightness— LCD brightness levelLCD Reflex— LCD inversion — invert the display for readability in different lightingAUTOLOCK— Automatic keypad lock — engages after idle timeout to prevent accidental key pressesSee the full RT-900 menu reference for all menu items.