A package-on-package device includes memory chips side-by-side on a package substrate. A user may be a human andor animal in need of a particular active ingredient. The detection is facilitated by reiterating a selection of cells and a handover vertical handover procedure, while relaying and coordinating transmission and reception. The method allows the semi-automatic or automatic calculation of the dimensions and locations of said structures. In addition, the operating mode change-over switch can be used to activate a \u201cdrilling\u201d operating mode, in which the striking tool is decoupled on the drive side.