The application relates to a medium viscosity, clear fabric softening composition, comprising from about 1 to 20 wt. The shield case is held in the perpendicular direction with respect to the printed circuit board by a fourth holding rib provided on the case. An operating unit calculates the degree of distortion of the reflection image on the basis of the density value distribution of the image photographed by the imaging device. The base plate is fastened to the body by brazing, adhering, fastening, press fitting or by mating engaging portions of a retention device such as a bayonet fitting. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. When the possibility of collision is higher than a given threshold level, the system starts to decelerate the system vehicle.