Patent ID: 8748803

Claim:
A portable electronic device of the electronic card type, comprising: (a) at least one electronic unit; and (b) one switch that is associated with the at least one electronic unit and that is actuatable by a user's finger, and that activates, or supplies, or activates and supplies, the at least one electronic unit with a command or instruction, wherein the one switch includes i. two independent photo-detectors that are oriented to receive incident light on a same surface of the portable electronic device and that are arranged sufficiently far from each other to enable the user to cover only one of the two photo-detectors with one finger; and ii. a logic circuit arranged to supply a first signal that only indicates actuation of the one switch when a first light reception signal and a second light reception signal, respectively supplied by the two photo-detectors, respectively correspond to a reception of light and to a non-reception of light or a covered state.