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Operation time of a receiving section is reduced by saving power supply to the receiving section upon reception of the signal of a self-transmission rate when another transmission rate signal and a noise signal are received and power consumption is reduced. A timer section counts the time since a control section starts the power supply to the receiving section and a transmission rate detector section is operated when a predetermined time elapsed and power supply to the receiving section is interrupted when the transmission rate detector section judges that the transmission rate of the received signal is not a self-transmission rate for reduction of the power supply time of a battery.