| 摘要 |
The present invention relates to a device at alarm system relating to a safety alarm system where mobile units are arranged to transmit radio signals with short intervals. The radio signals are received by a central unit. The mobile units are carried or applied to a person who shall be controlled as a consequence of illness. If the person moves out of an area which is not receivable for the centre, the centre initiates an alarm call to an alarm centre and/or a receiver for measures to be taken. Transmission of the alarm can be made via the public telecommunication network and/or over a mobile telecommunication network.
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