WBM Smart Air Purifier Create purified ambiance and healthier life. 3 in 1 Filtration function 1-pre-filter, 2- true HEPA filter, and 3- activated carbon filter captures the allergies and pets, Smokes and removes 99. 97% of pet dander, dust, pollen, odor, mold, etc. Effectively improving indoor air quality and freely enjoying the fresh air at home. keep your home purified with WBM Smart Air Purifier Create a purified ambiance and healthier life. WBM HEPA filter is easy to be replaced and disposed of without any tool required, ensuring you to replace your old filter in minutes. When your air purifier filter gets old, the efficiency will decrease when your air purifier is running, leaving more pollutants in the air. Therefore, it is recommended to replace your filters every 2-3 months. Filters are sealed to protect their lifetime. Please remove the plastic packaging of the new filters before placing them into the air purifier.