An electrical membrane switch assembly (20) for actuating electrical devices, the membrane switch assembly including first and second flexible membrane layers (62,82) in generally opposing relationship to one another, with respective adjacent and spaced ap...

The acoustic warning system has means for storing and playing back at least one analogue and/or digital tone signal. The signal transmitter is designed as a loudspeaker. The loudness of the played back tone signal is adjustable. The means for storing and p...