I purchased this last year and used it once. I've been storing it at home since then, but I don't think I'll be using it anymore, so I'm selling the device and the dedicated mat as a set. (The dedicated mat is double size.) The following is a quote from the product page of the store: "Kaisui Min" is a hot and cold water circulation eco-sheet (hot water mat) that keeps the entire sheet at a comfortable temperature by circulating water. In winter, it's warm and cozy with the hot water mode, and in summer, it's cool and refreshing with the cold water mode, creating a comfortable space all year round with just one device. In hot water mode, the temperature can be adjusted from 25°C to 60°C, allowing you to freely set the comfortable temperature to suit the user. In cold water mode, the sheet cools to around 20°C on average. After that, the temperature gradually returns to room temperature as the ice in the cooling bottle melts. ■ Specifications Product Name: Kaisui Min Model Number: F5300-A917 Size (Sheet): 1400mm x 1700mm