an electronic integrated circuit chip;

an antenna coupled to the electronic integrated circuit chip to supply an electric signal for powering the electronic integrated circuit chip; and

an ambient luminosity detection element external to the electronic integrated circuit chip;

wherein the ambient luminosity detection element comprises a band made of a photoresistive polymer or of a photoresistive resin that is electrically coupled to the electronic integrated circuit chip; and

wherein the electronic integrated circuit chip is configured to read an ambient luminosity level measured by the ambient luminosity detection element, compare said ambient luminosity level with a darkness threshold, and authorize a contactless communication only when said ambient luminosity level is greater than said darkness threshold.