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4. Click ESC button to exit menu, when finish or click Up or Down button to select next item.Gamma Adjustment (Brightness)8 levels of Gamma (Brightness) can be adjusted. (Factory Default is 4)1. Click OSD(Enter) to recall OSD Setup Menu.2. Click the Up or Down button to select 9th item "Gamma" on menu.3. Click Left or Right button to make selection : 0 ~ 74. Click ESC button to exit menu, when finish or click Up or Down button to select next item.65