The design of the Disc cameras (from any manufacturer) didn't really
vary much, so I expect it's typical of the breed:

http://en.wikipedia.org/wiki/Disc_film

Basically a fixed focus and exposure "Instamatic", which adds the
quality limitations of subminiature film  - but without the size
advantage. I have no idea what Kodak was thinking.

At least the Keystone had replaceable batteries. On the Kodak cameras,
you THREW THEM AWAY when the lithium battery died!