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Motion Sensors: It’s the most essential and common form of protection. Passive infrared sensors: Detect motion by sensing a sudden change in heat. Dual Tech motion detectors use two different technologies in the same unit: passive infrared and microwave. These devices are designed to avoid false alarms since both technologies must detect motion before setting off the alarm. Photoelectric Sensors: These sensors project a beam of light across a hall or doorway to detect motion and are triggered when a person passing through interrupts the beam. Glass Break Detectors: Usually mounted near windows to detect the specific high frequency sound of glass being shattered.
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Conclusion:When the clear morning of September 11th, 2001 was shattered with the first plane strike into the World Trade Center, transportation in the United States would never be the same.
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Most home security companies also offer smart devices — like locks, garage doors, and doorbell cameras — that pair with their systems and can be managed through their apps.