A gripping device for use with a hand of a user. The sensor interface assembly includes a base unit, a sensing unit and means for detachably connecting the sensing unit to the base unit. The core has first and second opposing surfaces, the first surface facing the lower clad layer and the second surface facing away from the lower clad layer. The metal wheel is disposed at the bottom of the feeding rubber wheel. In one embodiment the peripheral circuits are formed in a silicon substrate and an N level array is fabricated above the substrate. While one of the recording mode and the reproduction mode is being carried out, in response to start of the other mode, a controlling function of the operating section is switched to the function of the other mode, and in response to the completion of the other mode, the function of the operating section is switched to the function of the one mode.