Small but powerful compact size and small footprint, suitable for home-wide, dual-use desktop and floor-standing design, compact and easy to move. Powerful performance and a steady output of clean air. Traps 99.97% of particles as small as 0.3 microns 3-in-1 filtration for thorough purification, eliminate common indoor air pollutants effectively with layer-by-layer filtration, tüv rheinland allergy care certification strict allergen filtration guaranteed certified by the authoritative tüv rheinland, xiaomi smart air purifier 4 compact is proven to effectively filter out allergens in the air .