Aluminum Heat Diffusion Sheet: Prevents uneven heating from the heater, so the entire carpet warms up quickly. Insulation Mat: Energy-saving design that prevents warmth from escaping to the floor. Also considers cushioning. Acrylic Coating: Coating that reduces heat radiation to the floor while also considering slip resistance. This product is the heater unit only. Do not use this product alone. Please use it with a cover. (There are stains, but I think it will be fine if you put a cover on it.) Made in 2017, but I haven't used it much, so I think it's still usable. Please read my profile before purchasing. I review the price as needed, so please refrain from price negotiations. If you can pick it up in person, I will discount it by 1000 yen (in Yokohama city).