I have some background in electrical installations but didn't know whether it's possible to use this item for a 4 way switching system, looked everywhere no definite response. So I decided to shed some light on this: Yes you can use it as a matching switch, I used 3 of them for 1 DW15S-1BZ and you will find inside a VERY DETAILED instructions with drawings on how to connect them together which I didn't find anywhere online. This will make your task quite easy. Don't know why they don't put these online, made out my purchase look like as a gambling.
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