Compatible Model: The True HEPA air purifier filter replacement is ONLY compatible with TaoTronics TT-AP001 & VAVA VA-EE014 air purifier (Please confirm your machine model before buying ) Value Pack: Package includes 1 pack high quality air purifier replacement filter. Easy to install, snaps into place, no tools required Filtration System: The high efficient filtration system including fine pre-filter, high quality True HEPA filter and high efficiency activated carbon filter. Pre-filter can capture the larger particles in the air, such as dust, hair, pet fur and more. Activated carbon filter can capture large particles in the air and absorb peculiar smell, such as smoke, pet peculiar smell and more Replacement frequency: According to different frequency of use, we recommend replacing the filter every 3-5 months to keep the air purifier working efficiently