| 摘要 |
An alarm system comprising an alarm signalling device comprising a transceiv er for transmitting an alarm signal. The system comprises a responder device fo r receiving the alarm signal, the responder device comprising means for signalling an alarm. The alarm signalling device comprises interface means f or receiving user information and activating means for activating the transceiv er 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.
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