The Swiffer Continuous Clean Air Cleaning System continuously circulates and filters out airborne dust and dirt, and it prevents them from settling on your furniture, so you can go longer between cleanings. And the device is quiet. A bit from the company: Patented Swiffer technology uses Triple Layer Filtration to Trap and Lock away dirt, dust and allergens*. Great for pets! AND KEEP COSTS LOW with replacement filters that sell for a fraction of the cost of more expensive HEPA filters - $5. Average filter life is 30 days of use. SPECIAL BONUS PACK includes 2 additional bonus filters, for a total of 4 filters. * Inanimate allergens from dust mite matter and pet dander. Amazon has one 3rd party seller at $89.95, other sellers on Amazon & eBay seem to be selling it for over $100 - that's above the MSRP!