I'm on the phone so I won't google, but this is a very old story and if you go to the guy's website, he has a writeup of exactly how he did it. (and yes, the LEDs are hacked, they contain another hidden component)
https://plus.google.com/+HenrykGasperowicz/posts/dpwCPFDb3XM...
https://plus.google.com/+HenrykGasperowicz/posts/dpwCPFDb3XM...
https://plus.google.com/photos/+HenrykGasperowicz/albums/585...
So, indeed. Off on the details though, he's managed to sandwich the whole RF generator into that switch package. Mad props and soldering skills way beyond anything I could ever do.