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Security alarm
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==Cross-zoning== Cross-zoning is a strategy that uses multiple sensors to monitor activity in one area and software analyses input from all the sources. For example, if a motion detector trips in one area, the signal is recorded and the central-station monitor notifies the customer. A second alarm signal—received in an adjacent zone within a short time—is the confirmation the central-station monitor needs to request a dispatch immediately. This method builds increased protection.
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