PIR (<a href="https://en.wikipedia.org/wiki/Passive_infrared_sensor" class="extiw" title="en:Passive infrared sensor">en:Passive infrared sensor</a>)
<a href="//commons.wikimedia.org/wiki/User:Bercik" title="User:Bercik">Bercik</a>
BSD
<span class="int-own-work" lang="en">Own work</span>