Do you have a big idea that needs a small motion sensor? The PIR Mini Sensor's compact form factor is ideal for small-scale projects, and those where the electronics need to be hidden or protected. The narrow, vertically oriented board can slip through a hole in an enclosure to hide and protect the electronics, leaving only the small lens visible on the outside. The PIR Mini Sensor detects motion up to 12 feet (3.65 meters) away. Like the other passive infrared sensors we carry, the PIR Mini is a pyroelectric device that senses and responds to changes in the infrared levels emitted by nearby objects.