PUREBURG True HEPA Filters Compatible with Dayette AP401 AP402 and JOWSET AP402 AP403 Air Purifiers,H13 4-Stage Filtration Activated carbon 2-IN-1 Air Clean Dust VO After filter replaced,Press and hold the filter replace button for 5 seconds until the replace filter light turns off. 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. PUREBURG - Pure Your Breath! We value your satisfaction. If you have any problems using our product, please always contact us.