Simply press the soft knob and the blades rotate for even chopping. An internal soft bumper absorbs any shock to increase comfort. Chop ingredients in the enclosed cup with its soft, non-slip base, or remove the base and chop directly on a cutting board. A tab rotates within the cup to prevent food from accumulating on the side walls. • Butterfly Opening to clean blades. • No need of changing blades. • Combine food as you chop. • Rotating Stainless Steel Blades. • Separates outer skin from Onion and Garlic! • The more you slap; the finer the food.