R80APM air resistance plus patened magnetic resistance system -6 extra levels of magnetic resistance adjustment bc9188 computer - 1 big lcd -page 1, speed, total strokes, time -page 2, strokes/min, distance, calories -telemetric chest band heart rate optional -real time clock -adjustable angle extra strong aluminum beam super smooth seat rolling action -precision ground rollers -high quality bearings pu contour molded seat folds for storage -strong, secure fold-clamp lock system -fold-clamp locks machine in folded position large(38mm-1.5'