The magician takes out 10 cards with different pictures printed on them and makes the spectator choose one of them at random while the magician does not know which card is chosen.
The magician takes the chosen card back to the 9 cards and places all the 10 cards on the table.
He takes out the Perspective Eye and lets the Eye scan the 10 cards one by one,the chosen cards is detected by the Eye when it blinks!
That is an amazing Blinking Eye !
It includes a blinking eye,10 cards and online instructional video