A device and method of forming a power generator includes a container, a fuel cell stack within the container, a metal hydride hydrogen producing fuel within the container, wherein the fuel cell stack is sandwiched between the container and an anode support surrounding the fuel and in close thermal contact with the fuel. The temperature sensing device may be easily secured to the base with a magnetically secure device by the users, and may also be easily disengaged from the base when the temperature sensing device is hit or collided by people or objects inadvertently. Irradiating assemblies can also have first and second reflector portions at angles with respect to each other wherein radiation is reflected out of a housing that does not have an end reflector. A compensation value calculating section calculates compensation values for compensating variation according to the transmission paths on the basis of the first combined signal, the second combined signal, and signal on each transmission path in which a variation has not occurred or in which a variation has occurred. An impedance-matching circuit may be employed in place of the conducting wire to facilitate impedance matching between the antenna and the IC. The container pivots upwardly about a fixed horizontal transverse axis when the animal tries to remove the container from the support.