A wireless phone is equipped with a 2D optical sensor, enabling a variety of applications. The magnetic powder is an alloy comprising 1-10 wt % Si, 0. Each first touch electrode series has a plurality of first touch pads electrically connected to each others. The conversion of phosphoric acid to a polymerized phosphate content or reduction of transition metals to a reduced form results from the activated carbon having been treated with inert gas or carbon dioxide at from about 1200\xb0 F.