Nest Cameras

generic security camera
The image shows the generic security camera I use for the 6 internal cameras.
They output an analog video that goes through coax to a DVR. They run on 12vdc.

Overhead cameras are indoor only.  They are mounted in an enclosure.

The porch camera is a standard Sony Handi-cam. About 20 years old.  Google sony handycam 25x optical