This is a housing for a Raspberry Pi Zero W along with a Pi IR Cut camera with Infra red LEDs. The housing has ventilation to allow heat to escape and exposes the USB power port on the Pi. It has a recess for standard tripod thread brass knurled nut which can be used for tripod mounting.
The two IR reflectors and lens are held in place with rubber o-rings and can be easily pushed out if needs be.
I've also embedded smaller knurled nuts in the face plate to allow long screws to be fed from the back to hold the two pieces together. The Pi is screwed to the backplate using M2 4mm self tapping screws.