The Glo-Ray® Heated Stone Shelf is a built-in shelf that measures 49-5/8" x 19-5/8" x 2-1/4" and has a temperature range of 100-200°F. It is cULus and UL EPH Classified, and ANSI/NSF 4 certified. This shelf is made in the USA. The standard features of the Glo-Ray® Heated Stone Shelf include being made of food-safe materials and coming in three decorative stone colors. It can be used as a portable or built-in model. The shelf has an adjustable thermostatically-controlled heated base and a blanket-type foil element that creates uniform heat across the entire surface. Portable units come with a 6' cord and plug, while built-in models include a control box with a 3' conduit and a 6' cord and plug. Options available at the time of purchase include different simulated stone colors, adjustable legs instead of rubber feet for certain models, and designer colors for the flush mount control bezel box. There are also options for different control boxes, conduit connectors, and recessed tops.