The machine is called O'2nails Mobile Nail Printer, and is a gadget that has the ability to take a picture or let you upload a drawing or whatever, and print it on your nail. For years the fans experimented with the nail art, and showed elaborate drawings and designs, but this product avoids all the bureaucracy to simply leave you a pattern that you can wear wherever you want.
The process is relatively simple: first clean the nail and put a kind of sticker to ensure that the surface is even. After this, the finger is inserted in the O'2nails station, which in a couple of seconds (and completely painlessly) leaves your design on your finger. The commercial version is small and portable, and can be operated from the phone through an app.