A device is provided, including a deformable shell defining an inner space including at least one piezoelectric system. The piezoelectric system includes a flexible piezoelectric membrane capable of generating electric energy under the effect of a deformation to which it is submitted, a rechargeable electric power source, formed on a flexible substrate, and an electronic circuit. The electronic circuit includes a processing circuit for generating and storing data according to the electric energy generated by the piezoelectric membrane, and connected to the electric power source for its electric power supply, and a wireless transmitter connected to the processing circuit to transmit the data stored therein and connected to the electric power source for its electric power supply. Each piezoelectric system is totally arranged on and/or inside of the deformable shell.