XTERRA Fitness ERG400 Air & Magnetic Resistance Folding Rower Extruded aluminum seat slide rail with steel supports provides incredibly smooth motion with superior frame strength Monitor features easy-to-read adjustable angle LCD console clearly displays elapsed time, stroke count, distance, calories, strokes/min and watts Innovative frame design folds up for easy storage when not in use 16 levels of electronic resistance for a variety of exercise options Magnetic and air resistance system is friction-free for smooth, quiet and maintenance-free operation