The Holmes aer1 Mini Tower Air Purifier with True HEPA Filter captures particles as small as 0.3 microns from air passing through the filter, and is 99.97% efficient in removing common household odors and allergens such as pollen, dust, mold, pet dander, and smoke. The optional ionizer also helps to ensures smaller particles are more easily captured, and helps tackle odors. The air filter also offers 30% better dust elimination than traditional Type A HAPF30 filters at clean air delivery rate passing through the filter. You can see the particles being accumulated through the Visipure Air Filter Window, and this Holmes air purifier has a filter reminder, so you know when it's time to change the filter. The space-saving design easily fits in any corner of the room, leaving clean and crisp air all around your home. Color: Black.