An aerocar includes a body and a multiple of wings. The insert includes an upper end portion which rests upon the upper end of the conventional feeder and a conical-shaped portion which extends downwardly into the interior of the feeder. The shoulder strap is removably attached to the outer casing through a pair of connecting rings. The thermoelectric device is fixed to the base with a first solder, while the carrier is fixed to the thermoelectric device with a second solder whose melting point is smaller than the melting point of the first solder. A second amplifier circuit amplifies an output analog signal from the subtracter circuit by a gain of 2 and outputs the amplified signal. A curable composition comprising a fluorinated polyarylene prepolymer having a crosslinkable functional group, and a compound having a molecular weight of from 140 to 5,000, having a crosslinkable functional group and having no fluorine atoms.