Here are some useful information in general for your reference Five-Stage Filter: The real HEPA-H13 filter is used in conjunction with ultra-fine pre-filter, activated carbon filter and nano-silver coating filter, which can capture 0.03 micron air particles and remove 99.97% of dust and pollen, pets Dander and dust mites, soot, VOC, etc., improving the indoor quality of air, enjoying the fresh air in freely. ✅100% Ozone-Free : FIWOTTTDA air purifier, safe wavelength of ultraviolet rays, will not produce ozone harmful to children and asthma patients. Safety and certification: CARB certification, EPA certification, ETL certification (applicable to California) ✅Wide Coverage: With CADR 400m³/h, our large room air purifier can cleans a room up to 1,540 sq ft in one hour. Perfect for living rooms, large room, bedrooms, offices, nurseries, dorms, and kitchens ✅Child Lock: Long press the wind speed button for 5 seconds to lock the LED screen, thus effectively avoiding misoperation by pets or children caused by curiosity. ✅Sleep Mode: The air purifier can switch to 25dB sleep mode at night. In this mode, the indicator light will go out to provide you and your baby with a quiet, peaceful sleep and fresh air.Note: When using for the first time, please open the filter of the air purifier, take out the filter, and then remove the plastic bag.（Replacement filter ASIN:B091YTVNFY）