Motion sensors are devices that detect movement in their surrounding environment. These sensors are commonly used in security systems to detect intruders or unauthorized entry. They work by emitting signals and then measuring the reflection of these signals off of objects in the area. Motion sensors are also utilized in automation systems to control lighting, temperature, and other home appliances. These devices can be either passive infrared sensors, microwave sensors, or dual-technology sensors. Motion detectors are ideal for both residential and commercial use, providing an added layer of security and convenience. They are essential components in modern smart homes and building automation systems.