I don't think this is the precise one, but something like this:
https://smile.amazon.com/UTK-Tourmaline-Infrared-Auto-Off-Controller/dp/B08SQV9L5C/ref=sr\_1\_24?crid=1HSCIR0JMTU5I&keywords=hot%2Bstone%2Bmat&qid=1664849265&qu=eyJxc2MiOiIyLjI1IiwicXNhIjoiMS4wMCIsInFzcCI6IjAuMDAifQ%3D%3D&sprefix=hot%2Bstone%2Bmat%2Caps%2C145&sr=8-24&th=1