Very sorry....got my acronyms mixed. The switch is not RF, it is InfraRed.
The switch is not X10, and it is a standalone device with its own IR receiver. It is white, looks like a rocker, but it's really a push-button, with a small rocker to control the range of the dimming.
The cost was about $60 CDN, which I believe should be about $39 US.
The reason I mentioned it was because I had been looking at X10, and didn't want to have to buy all kinds of devices. When I went to Home Depot, they mentioned they were getting this new IR switch very soon, so I waited. Well, they got it, and I love it.