A system and method for detecting a sound originating from a body and enhancing signal-to-noise ratio with respect to noise originated outside the body is disclosed. The stain remover is effective in minimizing the amount of an organic solvent to be used. Such a hinge mechanism is provided with a spring element which actuates an adjusting lever during a collision while the adjusting lever acts directly upon the front hood and rests thereupon either directly or via intermediate elements. The first switch is closed when the received smart card is at an end of travel in the housing so that the power supply voltage is provided to the microprocessor, and is opened when the received smart card is no longer at the end of travel in the housing so that the power supply voltage is not provided to the microprocessor.