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Update: Aug 1st 2013: Added caveat to clarify what will NOT work, formatted for easy read and to think why this has so few votes :-). Does not matter as long as this helps anyone and thats the reason we write review(s) and share information. Journey/Failures: I had been unsuccessfully playing with Leviton's ODS-10-id to create a multi-location sensor, example across the staircase, while Leviton set-up works but due to unknown reasons to me or to Leviton's Support, sensors switch on lights even in bright day, really bright. So I had been looking for an alternate solution. Solution with Caveat: Lutron does not publish or even their support declines the multi-location occupancy sensor. I did post a picture for wiring diagram as "to be tested" but I can confirm now as "it DOES WORK". Caveat is that both the switches need to timeout or manually shut off to switch off the light/load. Other than that it automates everything for you, I never had a need to switch off lights manually so far in past 1 year+. HOW TO: Again, please do refer to my diagram as well. So for wiring for a 3-way, as you already know, there are two sides. One side uses the line/hot known as HOT SIDE and other one has the wire that goes to load known as LEG/LOAD SIDE. Both sides are connected to each other via TWO Traveler wires. How to find HOT: Switch off breaker, open box, disconnect all wires from existing switch, Switch on breaker, check line/power, mark hot wire, switch off and proceed with sensor connectivity HOT SIDE (refer diagram) ======== Line/HOT - Black (top) of Sensor + Traveler Wire A Traveler B - Black (bottom) Bare Copper Ground - Bare silver + Green LEG SIDE ======== Traveler A - Black (top) of Sensor Traveler B - Black (Bottom) + Load Bare Copper Ground - Bare silver + Green Blue - Not connected in both sides DISCLAIMER: Did work for me and may/may_not work for you depending on wiring etc. I am just an engineer and a homeowner with passion for automation and absolutely not an Electrician. When in doubt "please" call a LICENSED authority known as Electrician. Happy to answer any questions as always. The picture I posted, with colored wires, to ensure clarity although resolution is not so great after Amazon conversion. For high resolution leave an email address and will send you link from my personal cloud for clear printable pdf file.