Suddenly after 2 years, it turned on by itself! I thought it was the batteries, so I changed them, but after 3 months it signaled again and the radiator turned on! I removed the batteries and suddenly last week it signaled without batteries!!!!
What can I say guys, I'm looking for another simple mechanical one.

THE TRUTH is that by measuring the room temperature from 2018 until early 2025, it operated with excellent accuracy of 0.2 degrees Celsius. For the rest that I read have an accuracy of 0.5 degrees, you will definitely freeze 100%! However, after this period of use, the ON/OFF buttons broke in March 2025 from finger pressing, and it should be noted that they always needed a bit more force to work. I fixed them with my own makeshift solution and they work quite well now, though still needing a bit more pressing than before, but just a few days ago the background blue light stopped responding. I changed the batteries, but nothing. In other words... "it gave up." Its screen is now dark. Upon opening the device, however, I realized that the buttons are ridiculously made and would definitely break at some point since they are made from cheap material for such an unacceptably expensive product like a room thermostat. If nothing else, it should have lasted forever, but know that it will leave you at some point. If they had paid attention to the quality of its construction material, it might have lasted almost forever. So, I give it 4 stars because I have to pay for a new one, it's very expensive to buy, and I will need an electrician to install it if I can't manage myself. Basically, money down the drain!

One of the best thermostats (if not the best) on the market for its price. Small temperature step to maintain a stable temperature in the space within 0.5 degrees and not 1+ that others provide.