This was an extraordinary project initiated during the pandemic, involving an automated machine for sanitizing hotel key cards. Initially, the client had another company develop it for about a year, but the results were far from satisfactory. At the end of 2021, they turned to us, hoping we could complete the development. Aside from retaining the machine’s external appearance, we completely revised and redeveloped everything internally, from the circuitry to the mechanical components. The client was very satisfied with the prototype. Although the product did not go into mass production due to the end of the pandemic, from a product development perspective, it was still a successful project.