e-FortuneCity&reg; Simplicity Beauty 400ml 7 Colors Color-changing LED Night-light Ultra-quiet Ultrasonic Negative Ion Aroma Humidifier Diffuser Essential Oil Diffuser With Time Setting (7 colors) Ultrasonic Diffuser breaks up water & aroma solution into extremely fine micro-particles; high speed vibration of ultrasonic compounds the water and essential oil to anion for being absorbed by body. With the adjustment of the time mode and the amount and intensity of mist; you can easily adjust the mist control for the perfect moisture level that's right for your family. With 4 mist modes to choose by pushing the "mist/timer" button, continuous working, intermittent working, two-hour working and four-hour working. LED Light Diffuser relieves depression, stress, fatigue & headaches; changing light color automatically, or you can choose one color as you like. With auto-shut function, automatically shut off when there's no water.