HeatTrak HCM24-3 Carpeted Snow-Melting Door Mat, 24 Inch by 36 Inch, 120 Volt Snow-melting door mat; measures 24 x 36 inches Ribbed carpet surface provides your home with the look of a stylish high-end welcome mat Melts 2 inches of snow per hour; designed to be left outside for the entire winter season Includes GFCI power unit with 6-foot cable.Item does not generate heat unless it is below 35 F. Does not connect to HeatTrak residential stair mats or residential walkway mats