A foldable portable radio terminal is disclosed which normally optimizes an antenna characteristic by an antenna matching circuit even if the body length of the foldable portable radio terminal varies. In a second configuration, the coupling mechanism does not couple the first section to the second section. Each transmission family member employs three rotating type torque-transmitting mechanisms and two stationary type torque-transmitting mechanisms to provide the six forward speed ratios and one reverse speed ratio. Each roller in the assembly can individually rotate around its center axis as the assembly itself rotates over a specific RPM range causing the longitudinal side of each roller to continuously strike the tires’ treaded lower half at a predetermined position. When the sunshade is subject to a wind flowing upward from an underside of the canopy, at least a portion of the wind passes through the mesh, thereby reducing the force exerting on the canopy.