| 摘要 |
Memory stores data. A processing unit collects various data and stores the data in the memory. A power source unit provides electric power needed by the processing unit for collecting the data and storing the data in the memory. A receiver unit conducts reception or transmission of radio signals. The receiver unit controls the power source unit so as to make it supply electric power to the processing unit when a received radio signal includes a prescribed first signal, and when a received radio signal includes a prescribed second signal, the receiver unit reads the data stored in the memory so as to transmit it as a radio signal.
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