The calculator is a digital decoding tool that generates a unique 4-digit security code based on the radio's serial number. Version 4.0 typically refers to an updated database that supports a wider range of "oldtimer" units manufactured between 1991 and 1998, as well as various OEM models found in brands like Audi, VW, and Mercedes-Benz. Supported Grundig WKC Models
: It supports numerous models in the WKC series, including the WKC 2841, 3200, 3300, and 3803. grundig wkc series code calculator 4.0 download