ADVANCED AIR CLEANING TECHNOLOGY: B-D02U/B-D02L filter replacement effectively captures airborne particles from your indoor air such as dust & lint, dust mites debris, mold spores & pollen, pet dander, PM 2.5 & exhaust particles and more REDUCES ODORS: The B-D02U/B-D02L activated carbon filter helps to reduce unwanted odors, smoke & smog, harmful toxins, VOCs, paint fumes, chemical pollutants and more TARGET AUDIENCE: B-D02U/B-D02L filter replacement is made of 3-in-1 filtration systems including Pre-Filter, HEPA Filter, and Activated Carbon Filter. B-D02U/B-D02L True HEPA filter replacement is essential for households with Children, Seniors, Pets, Allergy, smokers and Asthma sufferers SPECIFICATIONS: Package of 4 B-D02U/B-D02L Filters. Recommended the replace every 6 months or depends on usage Color: White & Black Material: HEPA Package Contents: 4 x Air Purifier