| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a portable loss prevention device for valuables and the like requiring no battery replacement and causing no deterioration of an appearance of the valuables by arranging a small, thin, and light-weight signal reflection sticker requiring no power source for preventing loss of the valuables. SOLUTION: When the signal reflection sticker is stuck to the valuable and the like not to be lost, the portable transmitter receiver emitting a signal periodically gives an alarm by sound, vibration or light when the valuable is placed on the outside of the fixed range from a possessor, and consequently, the valuable is prevented from being lost.</p> |
