Ancheer Running Folding Treadmill Exercise Machine Cardio Fitness Non Electric US STOCK --- Non-motorized treadmill; Manual treadmill with heavy-duty weighted flywheel for smooth Operation This treadmill is portable folding and the height is adjustable Electronics display tracks speed, distance, time, and calories Weight Capacity: 150 pounds; Mainly for students , female, and yong men. Walk or run in the comfort of your own home; About the running belt keeps moving over to the side problems , you can adjust the left and right screws to make sure the running belt is in the middle position.