The file 'PIR Sensor Wall Mount Enclosure 3D Printer Model' is (stl) file type, size is 48.5KB.
This is an enclosure for the common PIR sensor module, such as the one sold by Adafruit:
https://www.adafruit.com/product/189
It has a 20 degree downtilt. 3 lids are available, one with no side/top blinders, one with 5mm blinders and one with 10mm blinders. The blinders could be useful to avoid detection from areas other than directly ahead and below. A common use case for this would be to detect a person as they approach a door and trigger an electronic release.
base.stl | 116.8KB | |
lid_10mm_blinders.stl | 33.7KB | |
lid_5mm_blinders.stl | 32.3KB | |
lid_no_blinders.stl | 26.6KB |