About this item Powerful H13 HEPA Filter and Activated Carbon FilterA medical grade true HEPA filter and activated carbon filter work together seamlessly to freshen the air. H13 means this filter only passes up to 0.05% of 0.1 micron particles per liter of air. Simple One Button OperationOne button controls two modes. Sleep mode is designed with dim night light, don't worry about disturbing light at night. In normal speed mode, the desktop purifier works with a brighter night light to create a cool and warm environment. Let you sleep peacefully without interference. Quiet Operation, Low to 32dB360 air inlet and outlet design can purify the air from all sides. The minimum noise is less than 32dB, almost equivalent to the sound of baby's breathing. Provides you a quiet and relaxing environment to sleep and work. Portable USB Air PurifierThe machine comes with an original filter (please purchase a replacement filter on Amazon, search ASIN code: B09MHMTH3C). The minimalist style design makes it look elegant and stylish anywhere and matches any room decor. It can supply clean air to areas of 5-10 m. The filter should be replaced every 6 months to ensure the best results (depends on ambient air).