A device for the application of a transcutaneous electric stimulation stimulus onto the surface of a section of the human ear, includes at least two electrodes and a control device designed for input of a stimulation current via the electrodes. The stimulation device includes: a storage element that stores an allowed range of values for a contact resistance, which contact resistance is given between the at least two electrodes when the device is operated according to the intended use； a measuring device for measuring the contact resistance which is given between the at least two electrodes； a unit for changing the range of values for the contact resistance which range of values is stored in the storage element. The unit can change the stored range of values when a contact resistance measured by the measuring device lies outside of the stored allowed range of values.
