Product Description True HEPA Filters Compatible with Xiaomi 4 Compact Smart Air Purifier, H13 3-Stage Filtration Activated carbon 2-in-1 Air Clean Dust VOCs Odor PM2.5 Smoke,2-Pack Resetting the filter While the purifier is on standby, press and hold the power button for 6 seconds. When the filter is successfully reset, the purifier will make a notification sound and the air quality indicator will remain green for 1 second. Any brand names or logos are the registered trademarks of their respective owners. Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility. Pure Your Breath! We value your satisfaction. If you have any problems using our product, please always contact us. 2-Pack, H13 3-Stage Filtration True HEPA Filters ,(A replacement filter is a combination unit that contains the mesh pre-filter, High-efficiency HEPA filter, and activated charcoal all in one) Compatible with Xiaomi 4 Compact Smart Air Purifier, H13 True HEPA capture up to 99.97% of airborne particles as small as 0.3 microns. This includes dust, pollen, pet dander, smoke, and other minute particles ,Activated carbon reduce Chemicals VOCs, tobacco smoke, PM2.5,common household bad smell,Fine Mesh Layer Prevents large particles such as dander,Pet hair Please replace regularly to keep your machine fresh and clean. For the best performance, clean the filter once a month with a soft brush gently or with a vacuum cleaner. Top-Notch Quality Used for Maximum Customer Satisfaction Guaranteed. Change the replacement filter in a minute, no tools reAdd Morequired. Note: please remove the new filter from the plastic bag before placing it into the machine.