An electronic device having a semiconductor circuit formed therein includes a semiconductor device in which the semiconductor circuit is formed; and a light emitting device, formed integrally with the semiconductor device, for emitting light indicating a reference position of the semiconductor device. Evacuation is powered by a pump operably connected to the control valve. The multilayer structure has a light exit face for emitting the generated light, whereas the glass substrate optically transparent to the light is bonded to the light exit face by a film made of silicon oxide. When the preset condition is satisfied, the direction estimating unit is used to estimate the occurrence direction of the latest collected sound, and to determine if the occurrence direction is within a preset range behind the user. The graphic plate is movable to switch the at least one of the graphic symbols to another of the graphic symbols.