Systems with PIN pads, magnetic stripe readers, or fingerprint sensors are often used for access control.    However, contactless alternatives are generally more convenient, just as safe and much more hygienic – and therefore make sense, especially in connection with the current spread of the coronavirus.    For example, if an infected person transmits viruses to the surface of a PIN pad, they can adhere there and survive for several days.    Other people can then pick up viruses sim...