An apparatus having a portable power source can make use of a plurality of differing charge depleted threshold values to determine what level of charge remains in the portable power source. The method has the steps of: forming a spacer adjoining layer that is adjacent to said spacer layer, Heusler alloy layer, and a metal layer successively in this order; and forming either at least a part of said pinned layer or said free layer by heating said spacer adjoining layer, said Heusler alloy layer, and said metal layer. The speckle suppressing module includes two biconic lenses and a diffuser. The rotating shaft is rotatably disposed at the main body. A second layer is formed to all exposed surfaces.