Tear off the protective film on the screen, clean the camera lens, on the settings page, set the resolution to 1920*1080, adjust the LED light to the maximum, the endoscope needs to focus, the viewing distance is 4cm to 5 m. You can find it at Find the best clear distance within this range, 4cm to 20cm is recommended, this distance is very clear and you can even read the words in the manual clearly.