... tray: electric cooling system buffet tray,serving tray,hot and cold tray: electric cooling system Usage and ... , home use, to serve chilled and heated foods at a desired steady, temperatures adjustable between 38°F to ... foods on this product.© Do NOT add new, hot food to a cool food, or cool food to ... than 40F, and NOT a traditional electric hot tray; that keeps food at, or over 140F.© This product is ...