I read the description and thought that this would be a great opener to use. However I want to say
this and warn anyone reading this away from it. The gimmick is poorly made (broke really quickly),
highly visible (it's supposed to be concealed in plain site, but really isn't), noisy, and really
just awful.
There is some palming involved, similar to how you'd change a card, and because
of that the way it works is just awful. I would really recommend against this trick.