Abstract: An accessory device for a first portable audio unit, for sharing audio data between the first audio unit and a second portable audio unit, the accessory device including communication means linked to the audio input and arranged in such a way as to send the inherent audio stream originating from the portable audio unit to an accessory device linked to the second portable audio unit and to receive a third-party audio stream from said accessory device of the second portable audio unit, and mixing means arranged in such a way as to receive as input the inherent audio stream and the third-party audio stream, and to send as output, to the audio output, a mixed audio stream corresponding to a combination of the inherent audio stream and of the third-party audio stream.

Abstract: An object intended to rotate in a flow of air (F), comprising a plate (2) with a general planar aspect and globally extending along a plane, the plate (2) comprising: a rear face (4) having a central area (16) on which an operator (6) is intended to exert a pressure force (F1) either directly or via a support; a front face (8) intended to receive the flow of air; a peripheral portion (10); and a main portion (14) extending between the peripheral portion; the plate having a stable shape at rest, the plate having a shape in use such that: the pressure force balances a resulting force (F2) exerted by the flow of air on the plate, so that the central area remains in contact with the operator or the support, and the flow of air exerts a torque on the plate causing rotation of the plate around an axis substantially perpendicular to the plane.

Abstract: An accessory device for a first portable audio unit, for sharing audio data between the first audio unit and a second portable audio unit, the accessory device including communication means linked to the audio input and arranged in such a way as to send the inherent audio stream originating from the portable audio unit to an accessory device linked to the second portable audio unit and to receive a third-party audio stream from said accessory device of the second portable audio unit, and mixing means arranged in such a way as to receive as input the inherent audio stream and the third-party audio stream, and to send as output, to the audio output, a mixed audio stream corresponding to a combination of the inherent audio stream and of the third-party audio stream.