The invention relates to a battery-operated electric hand tool device comprising control electronics, a wirelessly and contactlessly responding transceiver, and a storage unit in which an authorization code is stored, a locked mode of operation and a released mode of operation being distinguishable. The removable banknote stacker, when secured in the banknote acceptor, is operable by a drive member of the acceptor that remains with the acceptor when the removable banknote stacker is removed. Example assemblies include a flexible mount supported by a circuit board and configured to absorb a mechanical force when the plug is mated to the receptacle.