Transmit Data Through Your Skin Using NTT's Firmo

This is not science fiction, but a technology that is readily available to you by NTT. With this device, you can even open your door or locker just by touching it. It's definitely faster than a swipe card.

The new product, called Firmo, consists of a card-sized transmitter carried in the user’s pocket. The card converts stored data into a weak AC electric field that extends across the body, and when the user touches a device or object embedded with a compatible receiver, the electric field is converted back into a data signal that can be read by the device.

For now, a set of 5 card transmitters and 1 receiver goes for $8,000, but NTT expects the price to come down when mass production begins.