I read this post before I purchased a lot of Iris motion sensors, which are very sensitive. I purchased some opaque "Pex" tubing at Home Depot, and ran a drill bit through the center to slightly enlarge the center hole, and cut them to +/- 3/4" in length. On the Iris' the sensor does protrude a bit form the casing, making it easy to twist the tube onto the sensor. Works like a charm to "de-sensitize" the motion sensors for the cats running around.
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