Why is it smaller in volume? Sure that’s the decision of the person and has nothing to do with the device?

When phones first had cameras, and people were not aware, it would have been easier to secretly film. But news flash, where I’m sitting right now in a cafe full of tech workers, nobody would notice if I started secretly filming on my phone.

If I wanted to secretly film, I’d be more confident of getting away with it using my phone than with a set of glasses which have a flashing light on them.