According to the different devices, it can be divided into: low-light sights, active infrared sights, thermal imaging sights.

Low-light sight: It does not use infrared light, and uses the light emitted by the target under weak light to enhance the image on the screen under the action of the intensifier. People can see this image with the naked eye.

Active infrared sight: It is to irradiate infrared light to the target through the sight, and the infrared light is reflected by the target to form an image.

Thermal imaging sights: thermal imaging on sights