High-Efficiency 9-Level Auto Incline System: Elevate your fitness routine with our upgraded 12% auto-incline technology. By utilizing 9 adjustable levels, this walking pad treadmill substantially increases calorie-burning efficiency compared to walking on flat surfaces. Please note: Calorie readings are estimates based on movement sensors and average user profiles to help track workout intensity, rather than individualized inputs. Reinforced Steel Frame & 450 lbs Capacity: Engineered for stability and inclusivity, this auto incline walking pad treadmill supports users of all shapes up to 450 lbs. Whether you are aiming for a gentle walk or Zone 2 running at speeds up to 5.0 MPH, the sturdy construction ensures a safe and smooth experience for everyone.