... control inverter frequency, better speed control and smoother fitness equipment 2. 15" LED for TV, DVD and VCD 3. 8 LED windows display ... for time, speed, distance, calories, pulse rate, couterdown. 4. CONTROL SYSTEM:AUTOMATIC VECTOR FREQUENCY CONVERSION CONTROL WITH 8 ... TIME,DISTANCE,PULSE SET WITH LED DIAL INSTRUMENT DISPLAY WITH AUTOMATIC TIGHTEN RUNNING BELT FUNCTION WITH AUTOMATIC ...