| 摘要 |
<p>The device (7) has an interface (11), which is designed for a wireless communication with an identification marker (1). An interface (14) is designed for a wireless communication with a communication server (8). An alarm generator (13) is provided for transmission of an alarm over the latter interface. The alarm generator verifies a communication signal of the former interface and a signal between the identification marker and the mobile alarm device, if the distance between the mobile alarm device and the identification marker exceeds a preset distance. An independent claim is also included for a monitoring system with a mobile alarm device.</p> |
