A universal swing hinge assembly for a gravity-closing gate can be attached to a guardrail on either side of a guardrail opening. The LSNs are established by the service provider and can be characterized by traffic type, bandwidth, delay, hop count, guaranteed information rates, andor restoration priorities. A temperature acquisition section acquires the sensed temperature. Moreover, a switch 5 is provided to switch a connected state and an open state between the resonance circuits 4A and 4B, and a voltage controller 11 is provided to control an output voltage applied to the load 10, by controlling the switch 5. The circuit board element connects with an adjacent circuit board element via the connecting units.