| 摘要 |
PURPOSE: An echo of life is provided to transmits a location signal to a friend or a family by pressing the emergency button, thereby reducing a report of disappearance. CONSTITUTION: An echo of a life is used as a waist belt. If a user presses a emergency button on echo of life during an emergency situation, emergency SMS(Short Message Service) is transmitted to a friend, a lover or family. Therefore, the location of a user is checked. The size of the echo of life is 10cmX5cm. If the echo of life fails over 4m from a cellular phone, a bag or a key, the echo of life generates a bell.
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