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You can use only one to pair with your ordinary 3 way switch, and it should be installed the box near the bulb which there is Load Wire. A neutral wire required 3. The KKcool Smart Switches can only support 2.4 Ghz Wifi.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.