ADVANCED AIR CLEANING TECHNOLOGY: B-D02U/B-D02L filter replacement effectively captures airborne particles from your indoor air such as dust & lint, 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 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 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.