‎StepTrac Elliptical Stepper Workout Trainer with Curve-Crank Technology, Hardware Parts, Owner's Manual

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CURVE-CRANK TECHNOLOGY: The curved crank applies constant tension to the X and Y axes, delivering a dead-zone-free rotation as you step. With a smooth operation and efficient motion, you can get the most out of your cardio workout equipment for home workouts.
RESISTANCE TRAINING MACHINE: The ergonomic crank allows you to easily and safely adjust the resistance level while still running for a full indoor HIIT workout. It features an LCD screen that tracks and displays calories burned, time, speed, and distance.