An apparatus and method for keeping output loudness and quality of sound in different equalizer modes. A spontaneous-emission-absorbing layer, which is made of yet another nitride semiconductor of the first conductivity type and has such an energy gap as absorbing spontaneous emission that has been radiated from the active layer, is formed between the substrate and the first cladding layer. The network comprises a register DMA controller adapted to support register access and at least one node adapted to the data. Only the copper foil is dissolved away with an alkali etchant to expose nickel. It is provided that the articulated connection can be produced by means of the first and the second connecting means, in the operating position of the retaining spring, in a mounting direction that is essentially perpendicular to an operating plane of the wiper blade. An input component includes a select key that causes the controller to successively move the selection marker displayed on the display component over the plurality of character keys so as to select one of the character keys, and a change key that causes the controller to change a display content of the display component.