4 in 1 function, air humidifier, ultrasonic aroma diffuser, 7 colors night-light and air purifier. Ultrasonic anion cold fog sweet humidifier. Humidifier atomization process releases large amounts of negative ions, can effectively remove floating in the air of smoke, dust, formaldehyde, bacteria, etc. Can give out the ultra fine and smooth uniform aromatherapy mist, ensure that you can absorb the every hydrated plant essential oil nutrient absorption. Also ensure a good night's sleep for family.