CentraLite 3-Series Motion Sensor is an automated security system. So the main intention of the makers is to protect your home. They can be programmed in a way not only to protect your house but also to save you from unwanted worries.
If the sensor detects motion in areas which are like the safest place or where you have your valuables, it can be set in a way to sound the alarm, work with HVAC system, and also turn on the lights. Additionally, you also receive notifications.
When you have a person working in your home, say, plumber or electrician, you would receive notifications as to when they left the house.
When it senses movement outside the house, it can be connected with the lighting system and turns on the light, thus discouraging burglars or intruders.