Dyson DC40 Multifloor - Silver (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 6-month warranty The cyclones inside a Dyson vacuum cleaner generate centrifugal forces many thousands of times the force of gravity Reconfigured air channels and improved flow efficiency reduce turbulence and preserve air pressure, so that the inner cyclones can extract more microscopic particles Self-adjusting cleaner head The bin on a Dyson vacuum cleaner is transparent so you can see when it needs emptying- and just how much dust, dirt and pet hair your Dyson machine has picked up