A method of power saving for a wireless transceiver is disclosed. A CPU for the camera drives the organic EL device, under a forward or a reverse bias, as required, to enable light of a green or a red color to be emitted. The self-standing container can be optimized for storing beverages or the like which are negatively effected by contact with air, because the content will be oxidized with the air. A document object model of the given web page is constructed.