A method to identify a supplier of good or services over the Internet by providing a home page with at least one link to a directory Web site for a class of goods or services. The power supply has a communication port for data for setting the target value. The translucent cover is constituted by a supporting portion which covers at least part of the display panel excluding the boundary portion, and a portion which is continuous to the supporting portion and includes a concave portion formed on the observer side in a position facing the boundary portion.