What is the principle of automatic sensor night light in Vienna hotel?

Using infrared and pyroelectric principles. The ordinary human body emits infrared rays with a specific wavelength of about 10 microns. When the infrared rays of the human body are irradiated onto the sensor, charges will be released outward due to the pyroelectric effect. After detection and processing, the circuit will generate a control signal to make the light turn on. After a certain period of time, the person leaves. Then the light goes out automatically. The automatic sensor lights in the Vienna Hotel work on this principle. Vienna Hotel was founded in 1993. As a Chinese business hotel chain brand, it adheres to the brand positioning of "sleep assistance as the core".