| 摘要 |
An alarm system for detecting intrusion into a premises having telephone service over a telephone line, comprising a plurality of wireless sensors arranged in an area to be monitored for generating unique coded wireless signals indicating an alarm condition upon detection of an intrusion, and an alarm module connected to the telephone line for detecting the unique coded wireless signals and in response causing at least one telephone to ring and to provide notification of the alarm condition on a specified one of the sensors.
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