1. Remove the objective lens cover. In the photography observation state, align the objective lens with the scene to be observed and look at the screen from the center of the eye. 2. Adjust the diopter wheel to make the screen clearer. 3. Adjust the focus wheel of the objective lens to make the observed scene clearer. The machine will automatically adjust the brightness of the screen according to the average brightness of the scene in the center of the screen. Electronic zoom can be realized by pressing the up and down buttons, and the magnification range of the electronic image is 1 - 8 times. 4. When the ambient light is relatively strong, an auxiliary lighting source is not needed. Turn off the auxiliary lighting source to save battery power. When the ambient light is too weak and the observation of the scene is not clear, turn on the auxiliary lighting source and adjust the brightness of the source to make the observation clear. 5. In the photography, video observation state, press the Screen Brightness\Auxiliary Lighting button to enter the screen brightness adjustment function menu. In the corner of the screen, the number after the word Bright indicates the current brightness of the screen. Press the up and down keys, the screen brightness varies between values 1 - 9; value 9 is the brightest.