The Ionic Pro Ionic Air Purifier delivers quality, state-of-the art, ionic air purification, at home or office, for less than half the retail cost of some similar ionic air purification units. Working almost silently, the Ionic Pro circulates air by first putting a positive charge into the air, then attracting the air with negatively charged collection plates These collection plates trap irritants and allergens, like pet dander, dust, pollen --- even particles as small as 1 micron, releasing purified air back into the room. Better yet, it costs only pennies a day to operate 24/7 and there are no replacement filters to buy --- to clean up, simply wipe the collection blades clean and re-install . Safe and "one touch" easy to use, Ionic Pro will give your family the clean air they need to stay healthy. The Ionic Pro is recommended for rooms up to 500 square feet. Comes with a 1 year limited warranty. Stylish, black unit is approximately 29" x 10.5" x 9",and 10 lbs, out of box.