An identification device includes a ring incorporating at least one radiofrequency transponder which includes at least one microcontroller and at least one antenna to emit an electromagnetic field conveying identification data. The identification device further includes an electrical circuit having at least one light-sensitive element. The electrical circuit is mounted electrically between the microcontroller and the antenna such that, when the light-sensitive element receives light, the light-sensitive element acts in a first state as an open switch to electrically isolate the antenna with respect to the microcontroller. When the light-sensitive element is masked, the light-sensitive element acts in a second state as a closed switch, so as to establish an electrical connection between the antenna and the microcontroller in order to permit a current originating from electromagnetic induction of the antenna to flow.