Purchased in 2020. I've taken good care of it and used it frequently, but the knob suddenly came off. I've decided to sell it since I've replaced it with a new one. It works fine if you push the knob back in, but adjusting the time might be difficult. Apparently, replacement knobs are available for purchase. I contacted the Joshin store where I bought it, and they said the knob can be ordered from the manufacturer. Please understand the above before purchasing. Thank you. I am not considering lowering the price due to shipping costs.