The Inertia Runner X3.5 is loaded with convenient features that make operation of your treadmill easy and convenient 18-inches wide x 54-inches long running surface The perfect home exercise system Exclusive Shock-Deck reduces the jarring impact of walking and jogging and makes it easier on your joints Touch Keys to instantly change your speed and incline settings with the touch of a button Easy-Touch system offers a secure method to change speed and incline levels while holding on the side rail handles Programs for Speed, Incline, Heart Rate and BodyFat burn Easy to read LCD 5 display windows 18 programs