e-FortuneCity&reg; Mini Portable Creative Retro Volcano Shape 160ML Built-in Colorful LED Ultrasonic Humidifier Air Purifier With Touch Sensitive Switch And 7 Colors Breathing Nightlight (black) This humidifier uses ultrasonic waves to instantly vaporize water in the tank, to produce a cool superfining mist and disperse negative ions, remove the bacteria in the air effectively. Cool volcano shape design, adding an outstanding feeling as a humidifer; 160ml tank capacity, working time is about 3-4 hours; touch sensitive switch, very convenient to operate. Creative 7 Color breathing night light function, creating hazy romantic atmosphere for you. Security device will switch off the unit automatically when the tank is empty, automatically turn off after 2 hours working. Promote your well-being, this diffuser disperses negative ions, which increases the flow of oxygen, relieving feelings of stress, headaches and ensuring better concentration and sleep.