A multifunction device (1) for the aesthetic or medical treatment of body parts, comprising: - a control unit (2), and - at least one applicator element (3) connected to the control unit (2) to be fixed to a body part of the person during treatment； wherein the applicator element (3) comprises at least: - an ultrasonic transducer (121), - two plates (111a, 111b) of an emitter of radiofrequency waves； - an emitter of laser light (131)； the applicator element (3) being provided with a printed circuit board (7) and having a contact face (8) from which the waves emitted by said components (111a, 111b, 121, 131) propagate.
