An improved long wavelength-band EDFA is disclosed. In the navigation system, traffic conditions information in a corresponding area is transmitted by means of a paging channel, thereby utilizing real time traffic information while maintaining the architecture of the existing mobile communication network without an additional apparatus and communication cost. Such alternative circuit configurations, with the frequency converter which in itself is designed for the main drive, by way of control of the rotary speed or the direction of rotation of the auxiliary drive, permit the implementation of additional flow-dependent functions such as for example flushing a washing machine pump free of washing threads and fibres caught therein. It is thus dimensioned so that, for closing the cartridge, it is pressed with a tight fit into the container part. The elastic member is configured for driving the slide plate and enabling the slide plate to slide along the main plate after the slide plate is manually moved to a predetermined position with respect to the main plate.