When using other phones or cameras to take pictures of realme phones, a red light flashes on the top of the phone (may be white in some environments), and it is invisible when looking directly at the phone.
Cause:
The type of distance sensor used by realme phones is an infrared sensor. Infrared light has a wavelength between microwaves and visible light and is invisible to the naked eye. But the light-sensitive element of a digital camera can sense the spectrum of infrared light, so it can be seen when shooting with a camera. This is a normal phenomenon, please use it with confidence.