The multi layered purification system absorbs the irritants and allergens known to cause irritation to the eyes, sinuses and breathing - including dust, pet dander, pollen, harmful gases, mould, bacteria, smoke and more; making the air you breathe hygienically clean. Filtration captures 99.97% of 0.3um ultra-fine dust and inhibits the spread of captured bacteria(2), and you can clearly see how clean the air is with a four colour indicator. Remotely monitor the air quality and control your Samsung air purifier via the SmartThings app from anywhere(3). It has a quiet night mode and a child lock for safety. (1) CADR greater than 320m3/h. Tested in the KACA (Korea Air Cleaning Association). (2) Tested on the AX40M3040WMD for xylene, benzene, ethylbenzene, styrene & formaldehyde gases. The filter media has over 99.97% dust collection efficiency, based on a particle size of 0.2um, as specified by 42 CFR part 84. Antibacterial function tested on the filter media of the dust collecting filter. Tested in the National Test Institute of Korea. (3) A Wi-Fi connection and compatible phone is required.