Pursonic AP180 4-in-1 Silent Low Energy Consumption Air Purifier with HEPA Filter, Ionizer, Night Light and Aromatherpy. (White) HEPA Filter- The HEPA( high-efficiency Particulate Air) filter with active carbon filters over 99% of all airborne particles and allergens from the air. Ionizer- the ionizer cleans the air by sending molecular particles into the room. Nightlight- the nightlight can be controlled separately and creates a nice atmosphere in every room. Aromatherapy- the air purifier is suitable for using aromatherapy! please note: aroma oils are commonly used in 3 drops or less. do not use other special solutions, expect aroma therapies such as eucalyptus and lavender. low energy consumption- this air purifier uses 80% less power than other air purifiers. the energy consumption is 2.5W. Silent operation and ozone free- unlike other air purifiers this purifiers produces zero ozone.