A corridor search process is used to identify locations of interest along a travel route. The resulting pad structure is used to make external electrical connection such as solder connection. A first switching circuit selective couples a gate of the first switching transistor to the input voltage and a first mid-level voltage supply. The grooved wick includes at least two adjacent lands that are in fluid communication with one another through a particle layer disposed between said at least two adjacent lands that comprises less than about six average particle diameters. The shield device evenly contacts with the electric connector completely such that an external connecting circuit of the electronic apparatus is hidden.