Stunning magic trick : the app will guess an hidden card without your help... or almost!

★ Effect ★

Spectators choose freely 5 cards.
You turn one of them face down.
Spectators take your device and enter the four remainng cards, one by one, into the app.
Finally, spectators turn over the face-down card in the app: it is the same card that you have just turned face down!

★ At no time you handle your device
★ No handling nor voice recognition
★ Can be performed several times
★ For seasoned magicians