A semiconductor device includes an SCR ESD device region disposed within a semiconductor body, and a plurality of first device regions of the first conductivity type disposed on a second device region of the second conductivity type, where the second conductivity type is opposite the first conductivity type. The focusing device has a changing focal length along a physical parameter thereof. A parameterizable instantiate model is produced from the generic model of the first 3D model by matching this model to the extracted data. A child-proof manual override may be provided for disengaging the audible alarm.