Lay hands on a working version.

It's all about quick turn and rapid prototyping. You will see design ideas in weeks and have working prototypes as quickly as possible, often within a couple of months. While the earliest versions may be overly simplified, this way you get a quick, tactile experience of the functionality. This gives insight into product development and improved user experiences.
        
This phase is done when you're holding a working, functional product that achieves or exceeds your goals. At this point it's often a one-off build that you can showcase and demonstrate. There is a lot of work that takes it from here to something that's ready to manufacture and sell, but that's all on our plate. The working prototype you now possess is what brings you comfort to proceed to the next step.