If your project will involve manufacturing gadgets or other products, we ask that you show as much as you can about how you're going to do that, including things like a production plan, an estimated schedule, and any other details you can provide for backers.
Projects that involve the development of physical products must feature explicit demos of working prototypes. While you can run a project focused on the creation of a prototype, you can't offer the product that is under development as a reward.