Notfallmeldegerät für ein Fahrzeug

摘要

An on-vehicle radio-communication terminal apparatus uses a main battery as a power supply, and receives electric power from the power supply. A decision is made as to whether or not a voltage of the electric power from the power supply drops below a predetermined reference level. When it is decided that the voltage of the electric power from the power supply drops below the predetermined reference level, an auxiliary battery is used as at least part of the power supply.