As the documentation states if you are going to install this with a standard 3-way switch - the motion switch has to be on the load side. The wiring can be confusing - its not wired like a standard 3 way is, so READ THE INSTRUCTIONS CAREFULLY. If you do - it works great. I have 3 of these - one in a 3way with standard 3 way switch and another with two of them together. Both work great!
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