Rolsen C-2221THF is a vacuum cleaner using Forth Generation Cyclone System. This means that there is a spiral force that causes the air and dirt sucked into the vacuum to spin at an extremely fast speed. It makes the dirt to be sent outside the pathway of the airflow and fall down into a collecting compartment.Rolsen C-2221THF is simple to use, easy to operate due to convenient design with fingertip controls. No need to touch the dust, HEPA filters is perfect for allergy sufferers. Construction and sound absorbing technology ensure a quiet cleaning experience.