A US firm has begun implanting microchips the size of a grain of rice in its employees.
Three Square Market, a technology firm in Wisconsin, said 50 of its employees had voluntarily signed up to have the Radio-Frequency Identification technology fitted from August.
Implanted between the thumb and forefinger it will allow them to pay for snacks when they are on a break, among other functions.
In a statement chief executive Todd Westby said: "We foresee the use of RFID technology to drive everything from making purchases in our office break room market, opening doors, use of copy machines, logging into our office computers, unlocking phones, sharing business cards, storing medical/health information, and used as payment at other RFID terminals.
"It's the next thing that's inevitably going to happen, and we want to be a part of it."