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Today we are discussing “motion detectors”. To detect an intruder who gets in through a window, door or other opening, a motion detector is a great way to activate the alarm. It’s not enough just to protect 2 or 3 doors or windows with sensors. Homeowners in Dallas and everywhere should invest in one or more motion detectors (depending on the size of your Dallas Texas property) to ensure that your home is fully protected inside. How do motion detectors work? More advanced home security systems like the ones used by Smith & Wesson Security of Dallas Texas utilize passive infrared (or PIR) technology. These sensors "see" the infrared energy emitted by an intruder's body heat. When an intruder walks into the field of view of the detector, the sensor detects a sharp increase in infrared energy. Consequently, the home security panel is instantly alerted, and our central station is immediately notified.