First, you will need a black wallet for this. If you don't own one, you need to get one. Second,
it's angle sensitive and should probably done with extreme audience management and not in bright
lights.
I think this device works best as a part of a larger routine. This should be used
in conjunction with a card to impossible location effect, or a rising card effect where the audience
has already seen you make other things levitate convincingly
Hope that helps