The for Smart Air Purifier 4 filter can capture and retain the smallest particles in the air, as well as delay dust, pollen, pets and tobacco smoke. The plastic base retains its shape and original appearance for a long time. Three layers of efficient filtration to protect H13 Clean Class - Efficient cleaning of air pollutants in the air The adsorption of particles effectively removes formaldehyde It is recommended to replace the filter every 6 months Designed to filter PM2.5 particles, pollen and .<br><br>Filter your pet's wool and dust High quality filters have a strong absorption rate, eliminating and absorbing unpleasant odors and gases such as volatile organic compounds Color: As shown Material: plastic<br><br>Package Contents: 1 x filter<br><br>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.