Now, the functioning prototype can be reproduced, further serving your initial objectives. It will be an instrument to discover any potential, unforeseen user issues, and more readily improved through focus groups and case studies.
Essentially, your idea has now manifested into a finalized product, ready to be exposed to a myriad of different points of view, and interpreted by consumer market specialists for optimization.
Questions about how intuitive your product is, potential misuse, general considerations missed throughout early development stages can now surface and be addressed. Depending on the type of product (i.e. medical, electric, plug-in, food exposure, etc.) you can now send it off to accreditation labs for testing, or approvals for FDA, UL and CE certifications.