The X10 XPS4 20 Amp Non-Dimming Switch (WS13A XPS3 WITH QUIET RELAY) is a smart home electronic device that allows for remote control of fluorescent or appliance switches. It is compatible with X10/Domia 10 technology and features a quiet relay for smooth operation. This product by X-10 offers convenient control of various devices in a smart home environment, making it an essential component for those looking to enhance their home automation system. The item was removed from the original packaging, but never used. I have it laying around, but never installed it.