... silent motor 3.negetivie ion generator 4.import from Taiwan Activated carbon and HEPA high efficiency air purifier Specification:Model: AC-2061Power ... filter : filtering 99.97% dust, smoke,pollen, allergen etc.4,Activated carbon filter : can remove odours and harmful gases efficiency 5,3 ... will be. 8.Noise:50/56/63db9,Negative ion function activated carbon and HEPA high efficiency air purifier