| 摘要 |
A portable alarm system is disclosed in which the alarm functions (14, 16, 20, 22, 24, 26, 27, 40, 42) are contained within a portable enclosure (10, 12), communication is maintained between the enclosure and wireless security contacts (28, 30) placed at points of entry, and the alarm is capable of initiating a telephone call to a security monitor station either by conventional hard wired telephone lines within a building, or by cellular transmission, or via 800 MHz trunking.
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