1、APPLICABLE SCENARIO: Filter, high efficiency activated carbon and fine pre filter design can work together to reduce airborne particles and harmful odors in living spaces, thereby improving air quality, ideal for pet owners, smokers and city dwellers 2、MAINTAIN EFFICIENCY: In order to maintain the high performance of the air filter, it is recommended to replace the filter element every 3‑6 months, depending on your frequency of use 3、ENVIRONMENTALLY FRIENDLY MATERIAL: Air filter element is made of ABS and filter paper, which is environmentally friendly 4、2PCS IN TOTAL: The package contain a total of 2pcs air filter cartridge, enough for you to replace and use, very convenient 5、FUNCTIONS AND EFFECTS: Air filter replacement can remove most of particles, allow you stay away from pollution