Passive infrared technology has been the gold standard for motion sensors for over 20 years, detecting movement by sensing body heat. Qolsys has added its proprietary S-Line sensor technology, creating a secure, encrypted wireless connection to the panel. It is triggered when a person or animal enters an area within its 30-foot range. It can be set to ignore animals smaller than 40 lbs., drastically reducing the chance of a false alarm caused by a pet.

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    QS1231-840 Motion Detector Guide

    Get started with your QS1231-840 Motion Detector.

    How to Program the QS1231-840 to the IQ Panel 2

    Learn how to connect the QS1231-840 Motion Detector to the IQ Panel 2 with this step-by-step guide.

    QS1231-840—Battery Replacement

    View instructions for replacing your motion detector's batteries.

    QS1231-840—Tamper Error

    Learn how to fix a QS1231-840 Motion Detector error.

    QS1231-840—Resolving a Malfunction

    View instructions for resolving a sensor malfunction.