The smell function would come from “olfactory biochips” that would simulate each dish’s scent and emit it for the visually-impaired user. Since this is still just an idea, the designers don’t describe exactly how those scents would be replicated and then separately contained in the device so that pressing a button to release would work.

If such a device were to malfunction, blind diners could end up smelling something akin to the restaurant’s entire kitchen.