A model vehicle runs on a running surface which comprises a substrate having an array of contact pins, the tops of the contact pins forming one electrode and the sides of the contact pins forming a second electrode. Further, the imaging lens satisfies a predetermined conditional expression. The envelope is provided with a protrusion and the opening of the scanner is provided with a shoulder. In one embodiment, the D type flip flop triggers at both the rising and the falling edges of the reference input, allowing a lower frequency input to be used while having the advantages of a higher frequency.