Smart Alarm Wireless Motion Detectorsare tailor-made to your home security. It is a smart device functioning to detect any motion movement inside the house within its surveillance area by identifying living things on the infrared radiation. These infrared motion sensors are also called Passive InfraRed Sensors (PIR). These wireless motion detectors can be added to Yale intruder/Sync Alarm systems based on your home security need. Some motion detectors can reach up to 200m away from the control panels.