![]() Put these in a hallway or other entry points to your home and, when it's armed and the sensor sees something move, the siren will sound. PIR sensors detect motion using infrared. If the connection breaks – in the event of an intruder opening the door – the siren goes off. They’re made up of two parts that form a connection when you close the door or window. Open/close sensors are for windows or doors. ![]() The two most popular types of sensors are open/close and PIR (passive infrared): Like a typical alarm, it will blast out a loud noise that will trigger when something activates the sensors.
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