The Swami Pen

NOTE: This is new.  It came from a magician's estate. 

The magician has a person select a card. The card is returned to the deck and shuffled. At this point the deck is fanned out face down and the magician passes out the Swami Pen as a wand to use. The spectator takes the Pen and waves the Pen over the deck as instructed. They are told that the Pen will find their card for them. When the climactic moment passes with nothing happening you tell them that the Pen has indeed found their card. You show them the message on the Pen and ask them to read it aloud. The Pen has indeed found their card! And the Pen is a real working Pen too!

Completely self working and east to do.
Includes instructions.