Passive Infrared (PIR) motion sensors from Lorex can be used to add some simple video-free security to your house. They are designed to sense any moving heat signatures that pass in front of the sensor. Simply peel and stick to locations around your house, including ceilings, walls, or the top of any flat surface, to know the moment any movement is detected. Pair up to 10 Add-On Sensors to the Lorex Sensor Hub or up to 32 to the Lorex Smart Home Security Center.