There's another cgi video on the site which shows how it is supposed to work. The device inserts a patch between the tube and tyre. You are supposed to pinch the tyre together which the video claims creates a gap between tube and tyre with the patch inserted into that gap. In my experience my tubes are usually stuck to the inside of the tyre so quite how the gap is formed I do not know. Or how the patch will unfold itself evenly I don't know either. The fact the video uses a lot of edits makes you wonder whether it actually works.