The Zenith Space command series of controllers were battery free and worked off ultra-sonic clicks to adjust your set. The 600 model came out in 1965 specifically for the new colour televisions appearing at the time and had the added merit of being the first controllers that could also adjust brightness. The receipt from this 600 example dates it from 1971 and the controller looks basically brand new as though the owner never even bothered to take it out of the packet.
These controllers are an interesting piece of social and television history and would be great for educational purposes. Click here for my blog post that explains the history of these controllers in more depth.