The present invention involves identifying media type in a media processing device. The shift register device includes a plurality of shift registers connected in series, where an ith shift register includes a main circuit and a trimming circuit. In this way, a switching frequency from a regenerative brake to a hydraulic brake is restricted to improve drivability when a state of charge of the battery 11 is high. The system can monitor the loading of the mobile radio antennas at the venue, and when the loading reaches a threshold loading point, the system can selectively throttle the data rates of mobile devices at the venue.