The invention provides an optical disk that enables high-speed reproduction of address signals. These systems are expensive and take time consuming to use. The chelating agent is a water soluble multidentate chelating agent, preferably a water soluble bidentate ionic chelating agent, and more preferably 1,2-ethylenediphosphonic acid. The second apparatus transmits information concerning the second apparatus to the first apparatus. The conductive ball contacts two adjacent ones of the terminal rods by bridging the top and bottom transverse flanges of the corresponding two terminal rods when the switch is in an ON position, and moves into the top or bottom receiving groove when the switch is in an OFF position. In one embodiment, the device includes a plurality of pixels formed on a substrate, wherein each of the pixels includes: a first electrode layer formed on the substrate; an organic emission layer formed on the first electrode layer and a second electrode layer formed on the organic emission layer.