PIR Motion Detector Outdoor, DDSKY 2-Pack Max 30M Reach Infrared Motion Detector Sensor Time Delay, Auto Identify Day and Night, AC 110-230V

the most important thing to understand is how passive infrared motion detectors work the motion is looking to see motion and the heat signature matching a human being to avoid false alarms it is important to avoid potential false alarm triggers like pointing the motion at windows televisions mirrors or reflective countertops also avoid fireplaces or space heaters windows are especially troublesome because they can be heated by the Sun and motion of objects show through you should also avoid aiming the motion detector at areas where there is a heat duck or air return vent even if these areas are not directly in the view of the motion detector they heat or cool an area quickly and cause motion from airflow Vince or air returns can cause curtains plants balloons or other items to move which combined with the temperature change may trigger a false alarm if you have pets there are a couple m