A computer-implemented method for preventing identity fraud in instant messaging is provided in accordance with an aspect of the present disclosure. The device exhibits good rejection of stray magnetic and electric fields, is convenient to use, and can be fabricated in a single chip, with or without associated signal processing and conditioning circuitry, using conventional IC processing techniques. The plaster carrier plates are attached to the wall by means of fastening devices which are inserted through the plaster carrier plates from the outside, a reinforcement is placed over the joints between the plaster carrier plates and at least some of the fastening devices, and a finishing plaster layer is applied to said reinforcement and the outer plaster layer. The bit rate used to send the media file to the client device can be adjusted based on the available transmit bit rate.