Here's how it typically works:

Motion Detection: The PIR sensor detects changes in infrared radiation in its field of view. When a person, animal, or object moves within the sensor's range, it causes a change in the pattern of detected infrared radiation.

Adjustable Light Sensitivity: This sensor typically has an adjustable light sensitivity setting. It allows you to control whether the sensor will activate the connected lighting when it's dark or only when the ambient light is below a certain level. This feature helps prevent unnecessary activations during daylight.

Time Delay: The sensor includes an adjustable time delay setting. After motion is detected and the light is turned on, the sensor will keep the light on for a specified period. This delay can usually be set to your desired duration, such as a few seconds to several minutes. It ensures that the lights stay on for a sufficient time when motion is detected and then turn off automatically when no motion is detected.

AC 220V Power Supply: This sensor typically operates on an AC 220V power supply, which is a common voltage level for household electrical systems in many countries.