Passive infrared sensors are often designed around pyroelectric materials, as the heat of a human or animal from several feet away is enough to generate a voltage.
Sensor inframerah pasif sering didesain mengelilingi bahan piroelektrik, sebab panas dari seorang manusia maupun hewan sejauh beberapa kaki sudah cukup untuk menimbulkan perbedaan di dalam muatan.