Operating device (11, 111), preferably for an electrical appliance, such as, for example, a cooker, with a triggering control area (15, 115), on which a finger (17, 11) or body part is placed to operation by means of triggering of a signal, wherein a transmitter (20, 120) sound - pulses against the operating surface (15, 115) and sends a receiver (22, 122) receives the emitted or reflected signals, and by means of an evaluation - means (24, 124) is evaluated by comparison of the emitted or reflected signals with and without the application of a finger (17, 117) or body part, characterized in that the transmitter (20, 120) by means of a coupling medium (126) with the operating surface (15, 115) is connected.
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