press in or shorten the coupling element this prevents the user from over pressing and potentially damaging or destroying the sensor element numerous elastic components can be used as the coupling element preferably an elastomer is used and can be directly connected to the electret microphone capsule diaphragm according to another embodiment of the invention a support can be provided below the operating field and the electret microphone capsule is placed thereon and is advantageously supported with respect to the operating field in such a way that although an operating force acts on the microphone capsule it does not cause sagging or deformation of the support the support is advantageously a printed circuit board electrical contacts or leads provided for the control or evaluation can be placed thereon in the case of a circuit board they are advantageously constituted by corresponding conducting tracks the support or circuit board can have a control circuit or the like provided for the microphone capsule and for example the complete electrical appliance in another embodiment of the invention several operating fields or areas on the cover are provided for different functions or separate functional units of the electrical appliance instead of a single operating field on the operating device these operating fields are preferably arranged groupwise or in juxtaposed manner in an operating area which can be correspondingly designed for special marking or identification in one preferred embodiment a one piece continuous cover is provided in which the operating fields are located or which inter alia form the operating area this.