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Here’s some information about “motion detectors”. To detect a burglar who gets in through a window, door or other breach, a motion detector is a wonderful way to set in motion the alarm. It’s not enough just to guard 2 or 3 doors or windows with sensors. Homeowners in Houston and all over the place should invest in one or more motion detectors (depending on the size of your Houston Texas property) to make sure that your home is completely protected within. How do motion detectors work? More superior home security systems like the ones used by Smith & Wesson Security of Houston Texas make use of passive infrared (or PIR) technology. These sensors "see" the infrared energy emitted by an intruder's body heat. When an burglar walks into the area of sight of the detector, the sensor detects a quick rise in infrared energy. As a result, the home security panel is right away alerted, and our central station is notified.