| 摘要 |
PROBLEM TO BE SOLVED: To usefully and effectively utilize limited power supply capacity of a detection sensor. SOLUTION: The detection sensor 10<SB>n</SB>transmits a state check signal for inquiring the operating state of a crime prevention receiver 20 at every first prescribed time to the crime prevention receiver 20 as a wireless signal while ringing an alarm sound, and after transmitting a detection signal or after transmitting the state check signal at every first prescribed time, controls power supply so as to supply power to all function parts which receive a state signal transmitted from the crime prevention receiver 20 as the wireless signal only for second prescribed time shorter than the first prescribed time. COPYRIGHT: (C)2008,JPO&INPIT
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