Exclusive herringbone weave design. Outdoor Heated Stair Starter Kit includes 2 mats and power cord. Power up to 8 stair mats or 4 walkway mats on one outlet. Doormat operates from separate outlet. View our buying guide for more information. Our Heated Outdoor Entry and Stair Mats keep your entryways clear and safe during the snow season without harsh chemicals that can pit or stain surfaces. Plugged into a standard outlet, the durable olefin-fiber mats melt 2" of snow and ice per hour, and can be left outside all season long. . . . . . New 40" x 60" mat offers more coverage . Single stair mats do not include power cords and must be used with a Starter Kit or connected to the runner. Optional 20-in. and 25-ft. watertight cable extenders can be used with the runner or stair mats . 6 ft. power cords; 120V . View instructions manual. Note: Not for use on composite decking.