There is provide a divided exposure technology capable of restraining deterioration in the performance of a solid-state image sensor. A parking system user sends a user-specific code to a parking system computer at the commencement of and at the termination of a parking period. The first filter also has at least two user-preset gain levels which may be alternately selected by a switch. As additional air is introduced into the cathode channels by the slowly starting compressor, the fuel cell stack produces more voltage until the system is producing sufficient net power to operate under normal run control conditions. The selector includes a USB host circuit controlling the USB devices, and USB device emulation circuits being respectively provided for the electronics devices and maintaining the connections with the electronics devices even while the USB devices are selectively being changed, and a control circuit coupling the USB host circuit and USB device emulation circuits.