| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable device capable of preventing a mobile telephone and a wallet from being mislayed and missed by coordinating them with the mobile telephone. SOLUTION: The portable device main body is designed to have a size to be put into the wallet to be operated by a battery, and to perform transmission and reception with the mobile telephone by using a transmitting and receiving antenna. The device is designed to detect a distance between the mobile telephone and an electric wave transmission reception distance detecting device, and to indicate the distance as being separated by operating a notification function when the distance becomes longer than the predetermined distance. COPYRIGHT: (C)2005,JPO&NCIPI
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