Embodiments include a method for securing a membrane material to a gate of a molecular receptor-based chemical field-effect transistor. The transmission power of the antenna, that is, a range of reach of the searching radio wave is variably controlled by a drive output voltage applied to the antenna by a variable power circuit, which converts a battery voltage to the drive output voltage. The SIOEC controls a quick switch which blocks or allows communication along communication busses connecting the systems to the SIOEC. The entryexit evaluating portion evaluates entryexit authorization of the visitor at the region through comparing the shared code included in the comparison data to entryexit evaluation information stored in the entryexit controlling device. If at least one shared entry is available, then the algorithm uses one of the shared entries. This can increase a stability of the housing on a supporting surface.