| 摘要 |
<p>An alarm system comprising an alarm signalling device comprising a transceiver for transmitting an alarm signal. The system comprises a responder device for receiving the alarm signal, the responder device comprising means for signalling an alarm. The alarm signalling device comprises interface means for receiving user information and activating means for activating the transceiver to transmit the alarm signal in response to the user information. The transceiver device further comprises means for receiving a response signal from the responder device.</p> |
