WARNING SYSTEM FOR SIGNALLING THE PRESENCE OF A RADIO FREQUENCY COMMUNICATION AND METHOD OF FABRICATION

摘要

The invention relates to a warning device (5) for signalling the presence of a radio frequency communication, said system comprising an indicator perceptible to a user and activation means (8, 9) able to sense or detect energy originating from said communication and to activate said indicator. The device is distinguished in that the indicator comprises a vibrator. The invention also relates to a radio frequency communication device, such as a chip card, a passport, an insert, a mobile telephone, comprising the warning system and a method of fabrication.