The professional design of The PowerMax Fitness TAC-330 Semi-Commercial AC Motorized Treadmill with Semi-Auto Lubricating treadmill motor is in accordance with a 2.75HP AC motor that makes the motor reliable in high speed. Compatible with the MP3 player through a line-in connection, the treadmill offers you the most enjoyable sports experience. Instead of just listening to music, you can speak to the phone while running. In TAC-330 Audio is available through a built-in speaker. With high protection of knees and ankles, users can work out safely!