| 摘要 |
Method and device comprising at least one wireless ID unit and at least one monitor unit for supervising and searching, e.g. for missing children or persons with senile dementia. A monitor unit with two-way short-distance wireless transmission can automatically and wirelessly supervise that one or more ID units, e.g. carried by persons, are within a defined radius from a monitor unit. ID units may with advantage be applied in a small pocket in a garment such as a traffic vest. A combination of an electronic compass, a directional antenna, auto- matic interpolation/extrapolation and a user-friendly user interface in a dis¬ play in a monitor unit provides a unique and automatic way in real time of searching for and locating the distance and direction of registered and acti¬ vated ID units. |
