| 摘要 |
The subject invention is an electronic fence adapted to warn of the undesired wanderings of young children and/or the approach of undesirable individuals to include means to immediately warn others in a restricted home or other area when an undesirable individual approaches a restricted area; such overall structure including pluralities of boundary markers with electronically based detection mans, a receiver device capable of receiving a plurality of radio signals, and means to display or project the activation of a detection device that further indicates which detection device has been activated in order that the observer can determine that a child or an individual is transgressing a given boundary limit and the area where such transgression is occurring.
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