They are intriguing and entertaining to watch. Each effect flows into the next, ending with a powerful finale. The entire routine is performed and explained on this excellent video. If a spectator could write a message on the back of his business card, seal it up in an envelope and in less than ten seconds you could know exactly what was written inside the envelope - that would be a miracle. This is exactly what you will do with The Working Performer's Sensor Envelope .
Nothing is added, nothing is taken away.
No other props are required. The envelope uses a new principle never, ever used in this way before. You will be truly astounded when you receive this effect. It has taken nearly a year of research, trial and error to achieve. This brilliant principle was discussed with leading mentalists.