<p>The module has coupling units cooperated in such a manner that adjacent electronic modules are connectable by cooperating the coupling units, where one coupling unit is a spring element-free pin (1) and another coupling unit is a spring element-free pin retainer (2). The spring retainer is designed as a recess e.g. through-hole, for the accommodation of the pin. The pin is designed in such a manner that the pin is enlarged after insertion into the pin retainer for the formation of an undercut (9) in cross-sectional change (8) of the pin retainer.</p>
