Although it may seem that $500k is not enough to make so many complex prototypes, the strategy I will use will make it feasible, since we will use a Resin 3D Printer to produce them with the greatest possible perfection in their details. See examples

For the screen, we will use a combination of two technologies. The first will be a 4K Laser Projector that will render the simulation of the operating system of all the devices at once. They will be next to each other and everything that is a screen will be bright and animated, and everything that is not will be off. See examples

The second technology that we will use for the screens will be Luminous Panels, similar to those used in bars, but on a smaller scale. This method has the advantage of having high quality and vibrant colors. In addition, it will allow investors to see the devices with their own hands. On the other hand, they will be static images. See examples