My original question was about a specific product but was marked off-topic. I've been doing more research since then in to the capabilities of wireless sound transmission and am surprised at the lack of available tech.
Is it at all possible, outside of dlna or similar standards, to reliably transcode speaker output to digital for wireless transmission and receive that signal wirelessly to convert back to speaker output (which would obviously need to be powered)?
The offerings that I've found barely seem to scrape the surface of what I would have thought feasible. We have been doing exactly this with simple FM radio for years.