The Medisana Air air purifier removes bacteria, fine dust, and unpleasant odors from rooms of up to 60m². If you quickly suffer from allergies or irritated eyes and airways, it's possible that the air quality in your house isn't optimal. The Medisana Air sucks in the air, passes it through a carbon filter, and blows the clean air back into the room. The colored LED lighting indicates when you need to replace the filter. That way, you can be sure that the air purifier does its job well.Note: the accompanying Medisana 3M Filter has to be replaced when it becomes saturated.