When I received mine I could not see how on earth you'd get the "psychic" spectator to do the effect
AND not know how he/she was doing it. I've used it on both lay-people AND seasoned
magicians/mentalists and (even with me lousy card handling which they caught onto) still couldn't
figure out the effect.
Best "hand-off" effect I've ever come across.
(Just wished
they sold different "ones")