| 摘要 |
PROBLEM TO BE SOLVED: To provide a stray being notification device stepwise detecting a distance to a child, a demented person, a pet or the like, and detecting them by an alarm. SOLUTION: A master unit having a first wireless communication device and a first alarm generation means 303, and a slave unit having a second wireless communication device and a second alarm generation means 304 communicate with each other, and the master unit measures a distance of the slave unit from a communication signal from the slave unit side, and changes an alarm type of 303 according to the distance to stepwise obtain the distance to a stray being. COPYRIGHT: (C)2007,JPO&INPIT
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