The apparatus supplied is self contained and ready to work. You can perform this as a simple color change. The apparatus is designed to simulate a set of traffic lights. Show the board with three red lights, as you tell the audience you took a short cut to the show, and found yourself at a dead end. You did not want to be late, so you snapped your fingers, and the lights change magically to a regular traffic light, and the way open so you could make it to the show on time! You could use two of these Color Changing Traffic Lights with two envelopes, to perform a Passe Passe type effect. Board with three red spots placed on one side, board with three different colored spots placed on opposite side instantly change places. Effect could be repeated enough as you wish. Since the change is under your control, you could always prove the audience wrong, regardless of where they say the respective spots are.
The apparatus is very easy to use, and with a little effect you could build it into a presentation for your kind of magic.