LightAir IonFlow Air Purifier, 50 Sky Proven Efficient - removes airborne particles from mold, dust, smoke, pollen, bacteria, virus, pet allergen and more for rooms up to 540 square feet Filterless - no expensive filters to replace, instead, a reusable collector that you easily wash in water Totally silent air cleaner so it won't disturb your activities Energy efficient - uses 10 times less energy than most of the other air purifiers 10 year warranty