best security systems for business 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. They are usually installed on a wall opposite or adjacent to the protected glass and are effective within about 15′ to 25′.

The touch pad is a wall mounted unit that owners use to activate the system so that it is prepared to alarm when triggered. If a door or window contact is broken, or an interior motion sensor is breached, an audible alarm will go off in the home. ADT systems can be customized to include a two way intercom. If an interior, or exterior, siren goes off, the voice of a live ADT security representative will come over the intercom to ask the homeowners about their safety and confirm that help is on the way from the police. ADT smoke sensors sound off if a fire is detected. ADT representatives are alerted and the fire department will be called.



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