Watch the eyepiece/display screen（12） and adjust the focus wheel according to the actual distance to focus until the screen is clear. If the light is insufficient or used in the evening, turn on the IR by pressing the IR button(3).Increase the brightness by pressing the button repeatedly.It has 7 levels of brightness(0〉1〉2〉3〉4〉5〉6〉7〉0...)The brightness can be adjusted according to your needs. Long press IR up to zoom.