An electronic apparatus comprising: a housing; an infrared filter window supported by the housing; and an infrared transceiver mounted in the housing so that infrared light emitted by the infrared transceiver is focused in the vicinity of the infrared window, and radiates from the infrared filter window in an approximately 30 degree illumination cone. A plurality of horizontal distances between the apparatus and the known location are determined, each of the horizontal distances associated with one of the vertical angles. The multilayer film has a shape having a first angle between a bottom surface of the oxide semiconductor film and a side surface of the oxide semiconductor film and a second angle between a bottom surface of the oxide film and a side surface of the oxide film. The computer conducts a connection verification starting the module to verify a connection between the module and a third node when the module is the predetermined module.