iPod stereo dock using iPod as remote?

I saw an article about this product that put a transmitter in the dock of any ipod speaker system, like the SoundDock, and the other on your ipod, so essentially, you were using your ipod as the remote while it played through the speaker system.

I can't find the article now, does anyone know what product I'm talking about?

 

I think that might be what I'm looking for, thanks.
Is iit the only one of it's kind, or does it have competition?
i think there's one with different technology (e.g. not bluetooth) cause I don't remember it being 130 dollars.