How to detect pinhole camera with beauty instrument

How can the beauty instrument be in dim light? The video recording function of the mobile phone can detect the pinhole camera when the infrared light is turned on.

The specific way is to close the curtains of the hotel, turn off all the lights in the room, and ensure that other electrical equipment such as TV sets are not electrified. At this time, the room becomes a strict darkroom.

Then turn on the video recording function of the mobile phone, aim the lens at the key parts, and keep your eyes on the screen of the mobile phone. If there is an infrared light, a bright spot will appear on the screen of the mobile phone, and the position of this bright spot is the position of the pinhole camera.