3-STAGE FILTRATION: The lv-h128 replacement filter has a three-stage filter design. The first pre-filter layer filters large particles such as pet hair and fur. The second H13 HEPA filter reduces 99.97 percent of dust, PM2.5 and dirt in the air. The third layer of activated carbon filters removes odours. A comfortable and safe environment for your children and family REPLACEMENT CYCLE: The use of a new filter can improve the efficiency of your air purifier, thereby ensuring fresh and safe air in the room. It is recommended to replace the lv-h128 h13 filter every 6 months. EASY INSTALLATION: Get fresh air in a few steps 1. remove the filter cover 2. unwrap the new lv-128 filter 3. place the filters into the air purifier 4. replace the filter cover Colour:black Material:Filter cotton Package Contents: 4 Pack x HEPA Replacement Filter 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.