A controler for a waterbed heater... has a remote probe, 110-120v, adjustable temp, cheap. I found one on craigslist cheap locally($5). I do HVAC and was trying to wire nice thermostats, transformers, and the like and realized I had more in the stupid parts I bought than I bargained for... I coud have had another snake and complete setup for the price of all the crap I bought(it was never finished due to budget issues and other projects)