A device for detachable fastening of an assembly part on a receptacle, the device including a base having a contact flange, at least one clamping arm formed on the contact flange, which snaps resiliently into a clamping position in a radial latching direction. The method may include an additional step of adhering a plurality of solder balls on the bonding tape to serve as external leads of the package. The connecting mechanism connects the motor generator to an auxiliary device and selectively connects the motor generator to the engine. The processing unit links each of a plurality of virtual input keyboards correspondingly to one of the input fields to perform data processing on the input fields according to the operation input on each of the virtual input keyboards.