1、Filter core paper is made of eco-friendly material and the whole is high-density fireproof fiber filter paper, which is non-flammable and no pungent odor 2、Multi-layer filtration and purification, effectively filter impurities, dust and gas odor in the air 3、Block fine dust in the air, provide better quality air and improve sleeping environment 4、Effectively filter fine particle dust to better protect the health of family 5、Filter the air that has entered the oxygen generator, remove the harmful dust and particles in air, ensure better intake of air Features: 1. Filter core paper is made of eco-friendly material and the whole is high-density fireproof fiber filter paper, which is non-flammable and no pungent odor. 2. Multi-layer filtration and purification, effectively filter impurities, dust and gas odor in the air. 3. Block fine dust in the air, provide better quality air and improve sleeping environment. 4. Effectively filter fine particle dust to better protect the health of family. 5. Filter the air that has entered the oxygen generator, remove the harmful dust and particles in air, ensure better intake of air. Specification: Item Type: Filter Material: Filter Core Paper Color: As Pictures Show How to Use: Open the back cover, replace the old one with a new one, and close the back cover Package List: 1 x Filter