The device has many mechanical discs that open and close as you gently glide it over your skin. This allows them to adjust to the thickness of your hair, thick or thin, to pull it out from the root—without touching your skin. The duration of your session varies from seconds to a few minutes and depends on the size of the area to be treated. This slows down hair growth, which can last up to four weeks, because Tresiore Epil Pro 3.0 affects your body's natural hair growth cycle.