Largest brush/pad selection, lowest maintenance cost, best performance on irregular floors, brushes individually driven. Inside the machine: Recovery lid, stainless fill screen, 6' remote solution fill hose, blow by vac muffler, sound deadening foam, tall rollers, patented vac bandeau, stainless scrub deck, bandeau unloader valve, non-marking solid grey tires, steel frame, poly battery box, stainless breakaway squeegee, stainless vac screen, central command, drain saver basket.