Abstract: A device for the conversion of electrical oscillations into acoustic waves or the conversion of acoustic waves into electrical oscillations, including an electro-acoustic converter and a housing with two housing shells (1, 2) in the form of plastic moldings. The housing shells fit together and are assembled into a single closed housing assembly with a sound window (8) associated with the electro-acoustic converter, conductive portions of external leads (10) are attached to the housing through contact elements (9) located on one of the shells. A piezoelectric element (4) is combined with a carrier foil (11) which includes a sound membrane (3). The carrier foil includes conductors connected to the piezoelectric element in the form of screen-printed conductive traces (12), the ends of which, remote from the piezoelectric element, are provided with a contact arrangement (14). Other functional components, including the contact elements, are situated on or in the housing shells.