You don't. In the article it states that it is to be put into the eyes of people with glaucoma.

there are no buttons.

You don't. In the article it states that it is to be implanted in the eyes of people with glaucoma.

I actually costs a few thousand dollars and is not available commercially.

You don't type on it and it is to be implanted so you would never step on it even if you got one.

A dime is smaller then a penny.