| 摘要 |
A portable device for receiving and sending a signal to an automotive device control system includes a communication means for receiving and sending the signal to the automotive device control system, a control means for controlling the communication means, a potential detection means for detecting electrical potential of a battery used to energize the communication means and the control means, and a detection control means for controlling detection operation of the potential detection means. The detection control means operates the potential detection means either in a continuous monitor mode or in an intermittent monitor mode in order to detect potential of the battery. The intermittent monitor mode is used when potential of the battery is equal to or higher than a predetermined potential, and the continuous monitor mode is used when potential of the battery is lower than a predetermined potential.
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