Abstract: A device for transmitting information by acoustic means, the device being constituted by a smart card of standardized format incorporating at least one microcircuit for generating signals for directly exciting a sound transducer, and an independent complementary unit, wherein said unit incorporates at least one smart card connector, an electric battery for providing electrical power to the microcircuit of the smart card, and the sound transducer for emitting the excitation signals transmitted by said smart card.