| 摘要 |
The proposed invention finds particular use in homes which do not have and/or in which the occupants cannot reach a telephone for phoning the police when an emergency condition exists, but which rely on neighbors, who do have telephones, observing the existence of an emergency condition and telephoning it in to the appropriate agency. The system includes an audio signal generator, either alone or packaged with a visual alarm, signal generator. Typically, the system includes a wall plate switch plate mounted on the interior of the dwelling with the system controls including a circuit board with a power supply, electronic delay and relay circuitry mounted in a convenient location. Alternately, a remote control unit can be used for alarm actuation. Under a potential alarm condition, such as when an unknown person comes to the door, the person within the dwelling can press a first SET switch which begins to time out a predetermined time delay or time interval. The person can then go to the door, and if there is no trouble, he can return and activate a RESET switch to prevent actuation of the alarm at the end of the delay period and return the system to it' s initial condition. If, however, an emergency condition exists, he can press an emergency switch button to immediately bypass or override the delay and actuate the audio-visual alarm enunciator.
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