28 of 29 people found the following review helpful
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This review is from: Chamberlain CWPIR Wireless Motion Alert Add-on Sensor (Tools & Home Improvement)
For the options this is my choice. I bought two base units and three transmitters. I live on five acres and feel safer that i know if a perimeter has been breached. I do have some redundancy because they don't allays fire off so with layers they catch it, and I'm not surprised by someone coming over. This is common with any PIR sensor no matter how much you pay for it. These PIR sensors are very well protected from climate which is half the battle with this type of sensor. They allow you to know which one was breached with number of tones.