Abstract: A sound system for a pool has at least a first wall and a second wall, one of which is intended to be at least partially submerged in the pool and the other to be above water, a first and a second electroacoustic transducer attached to the first and second walls, respectively, and a control unit configured to control and power the first and second electroacoustic transducers. The control unit has a radio-frequency communication module, including at least one antenna arranged in the sound system in such a way that the antenna is at least partly above a waterline of the pool.

Abstract: The invention concerns a bedsore prevention device (20) designed to be equipped to a support element of a piece of receiving furniture. The prevention device (20) has a bearing surface (22), intended to be flush with a surface of the support element and to be in direct or indirect contact with a body part of the subject on which the subject is likely to develop bedsores, at least three electromechanical transducers arranged to urge the bearing surface (22) to move, the at least three transducers being arranged along the bearing surface (22), a control unit (26) for the at least three transducers, the control unit (26) being configured to control the at least three transducers to urge the bearing surface in a phase-shifted manner in order to simulate a mechanical traveling wave along the bearing surface.