You need to simply adjust the product when you receive it at the beginning, because the running belt and the running board have a running-in process just after leaving the factory. The elasticity of the running belt and the deviation of the running belt can be easily adjusted. There is a welding interface at the connection of the running belt, which is not a problem of quality workmanship and does not affect the use at all. In the process of using the mechanical treadmill, there is the sound of the roller driving the running belt. The sound can be adjusted by adjusting the tightness of the running belt.The slope of this treadmill is adjustable, and the inclined slope is more conducive to driving. Because of the slope, it is necessary to grasp the handrails at the beginning of the exercise for better sports effect. The item "Folding Treadmill 4 in 1 Running Jogging Machine Gym Fitness Mechanical Treadmil" is in sale since Wednesday, May 26, 2021. This item is in the category "Sporting Goods\Fitness, Running & Yoga\Cardio Equipment\Treadmills". The seller is "top_fitness777" and is located in California/New Jersey. This item can be shipped to United States, Canada.