On what small everyday object has Google embedded a camera?

The addition of a lens is a continuation of a past Google project in which researchers created a smart lens that could monitor blood sugar levels. One possible use of such technology, as Google pointed out, is that a blind wearer could use the lens and the visual information could be relayed to the user through another sense, such as hearing or touch. A blind user could receive an auditory warning in the event of a fast approaching object, like a car.