KONE began its elevator business on the ground floor and is working its way up. The US subsidiary of Finland's KONE sells, manufactures, upgrades, and maintains elevators, escalators, and autowalks. The company's line of products range from eco-friendly (using no oil) traction elevators designed for low-rise office buildings to high-performance elevators used in skyscrapers standing more than 100 stories tall. KONE's escalators and autowalks, designed for indoor or outdoor use, are commonly installed in airports, stadiums, subways, and shopping malls. The company accounts for about one-fifth of its parent company's elevator and escalator sales.