Penthal by Kiko Pastur & Invisible Compass

stmagicbox.com...
Discover the ultimate smart-pen for magicians.
It combines cutting-edge technology with a sleek and discreet design, capturing every stroke and sending it in real time to your smartphone or other devices.
For the first time in the history of magic, this will allow the spectator to write on the palm of their hand without needing any other supporting surface, close it, and not open it again. Meanwhile, the magician will receive all the information simultaneously.