What does gradual, adjustable sizing mean and why does it matter?

Gradual sizing refers to the incremental size adjustments that occur from the wand area of Milli, which increases and decreases in diameter size. This feature allows the user to insert Milli once and gradually achieve the desired size instead of re-inserting different sizes. The sizing, by use of plus (+) and minus (-) buttons, is millimeter-by-millimeter.