A semiconductor device includes a second conductive-type deep well configured above a substrate. The body portion is made of a multiple filament helically wound row of wires, provided with a sealing coating on the inside surface or the outside surface or both. A hot-plug signal determination section is configured to determine whether the hot-plug signal has been received every t seconds when the TMDS signal has not been received. The introduction of oxygen in the gas may enhance the reproducibility of the overetch process. The tactile stimulator 4 is in communication with the output of the sensor 2 to deliver tactile stimulation corresponding to the magnitude of the sensed physical property.