A solenoid valve controlled by wireless communication, in which the operation of the valve is controlled by wireless communication, thereby reducing costs and labors necessary for installation and maintenance. A compression device is provided to supply the oxygen-containing gas, for example air, to the cathode chamber of the fuel cell. The apparatus includes a base with a stem extending from the base. The barrier driving member opens and closes the lens barrier. The opening-closing control section is arranged in the container and includes a humidity sensitive member that is elongated or shrunk in accordance with the humidity to open-close the air communication port. The synthesis consists of a single vessel acid catalyzed ring opening polymerization and may be employed to produce copolymers useful as hydrogel contact lens materials.