For Sale: Lifespan 4000i running treadmill. This was acquired at Second Wind Exercise in Sioux Falls was right at $1800 new. on the side manages are switches to change slope and speed and likewise the contacts for the heart rate monitor. It has speakers in the control panel so you can plug your mp3 gamer into it and listen to music. Has a usb port to put a memory stick in to move your exercise data to the Lifespan website to track your progress. This is no low-cost treadmill it is a cushioned running surface on it and a safety stop. Running surface area folds so it occupies restricted area when not in use. In Watertown $800 OBO.