The picture is not very clear, it should be an infrared sensor switch. The light is on when there is someone, and it goes out when there is no one. At the same time, it has light control!

Infrared sensor is a sensor that uses the physical characteristics of infrared to measure. Infrared light, also known as infrared light, has the characteristics of reflection, refraction, scattering, interference and absorption.

? A sensor that uses the physical characteristics of infrared rays to measure. Infrared light, also known as infrared light, has the characteristics of reflection, refraction, scattering, interference and absorption. Any substance can radiate infrared as long as it has a certain temperature (higher than absolute zero). The infrared sensor is not in direct contact with the measured object, so there is no friction, and it has the advantages of high sensitivity and fast response.