The present invention is a system and a method for selecting an appropriate location for displaying messages, such as graphic or textual advertisements, on the display screen of users of electronic devices. Receptacle connector 100 has: a hollow rectangular shape shield case which is made by machining a metal plate and which includes fitting slot 101; and a housing which is covered by the shield case and in which contacts to be connected with terminal parts of an inserted plug are disposed. A dynamic pressure bearing is composed by forming a dynamic pressure groove in either one of the shaft fixed in the through-hole by laser welding, and the circular tube part of the rotor boss, and the circular tube part of the rotor boss is supported by the shaft. a data unit or a pointer to a stored data unit. A hot beverage container with an insulating sleeve is inserted into the housing.