Theese are housings for minature PIR sensors you can purchase from many ebay sellers. Designed for 3d Printing. They have a tube that is over the PIR lens so that they can be used like beams you can break. side_mount = PIR sensor is parallel to the wall protrude = PIR is 90 degrees to the wall sticking out from it intrude = PIR is 90 degrees to the wall embedded in it
currently there is a little bit of work needed to make theese better