A cantilevered shelving system is provided for manual assembly along the wall panels of a molded utility shed. Environmental sensing device and monitoring device may comprise a data bus, at least one processing unit, a communications interface, and memory. A packet which should be transmitted is transmitted from a transfer judging circuit 200 to Ethernet 820a or 820b through a MAC unit 300a or 300b. The gate electrode substrate has an electron-passing hole and is arranged in the vacuum envelope to oppose the substrate to be separate from the cathode. The electrical contacts of the functional faceplate carry signals that are responsive to the pressing of physical buttons which may be placed in any location on the functional faceplate.