| 摘要 |
PURPOSE: To provide a mobile phone that has a missing (theft) preventing function of itself. CONSTITUTION: The electric field strength of a 2nd radio wave sent from both the mobile phone and its slave unit is measured to detect that the mobile phone and its slave unit are apart from a closest distance to transmit a warning tone or the like. Thus, when the mobile phone of the user is missing (stolen), the user can quickly recognize it.
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