... , speed/slope tuning key Emergency shutdown key, built-in axial flow fan.fan control key, speed/slope ± ... built-in speakers, MP3 audio interface.Function display Time, speed, distance, heart rate, calorie, program, difficulty level.Program 5 ... , each having 10 difficulty levels; 1 custom program.Slope 0-15%Speed range 0.8-18KM/ ... commercial / home use 3.0HP foldable treadmill fitness equipment for sale