The sensor uses advanced capacitive touch to take and essence a higher resolution image of your fingerprint on the subepidermal layers of your skin.

The inventor of the current limiting reactance coil was Vern E. Alden who filed the patent on November 20, 1917 with an issue date of September 11, 1923.

So we have a piece of paper with conductive ink on, and then add onto that a small circuit board with a couple of chips, one to run some capacitive touch software, so we know where we've touched it, and the other to run, quite often, some wireless software so the piece of paper can connect.