| 摘要 |
A mobile security system includes remote sensor units each having a condition-responsive sensor of a variety of types (motion, intrusion, loop, heat, water, etc.) and a transmitter for sending a signal to a master control to report a sensed condition. The master control includes a receiver for intercepting signals from the remote sensors and a transmitter for sending a signal to a remote alarm unit in response to a sensed condition. The remote alarm unit can be positioned to provide a sound to discourage an intruder or it can be positioned to alert a guard that an intruder or other condition has been sensed. One of the remote sensors is disposed in a pocket on the bottom side of a tarp which is used to cover goods to protect them from weather and theft. Any attempt to loosen or move the tarp to gain access to the goods will cause an alarm signal to be generated. The master control unit can activate a remote audible alarm, dial a telephone number to report, activate a cellular telephone to report, or activate a long range transmitter to send a signal to a remote second master control to report. All of the units of the portable security system are contained in weatherproof housings so that the entire system can be set up outdoors, if necessary.
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