It is USB mini aromatherapy humidifier. It has 70ml water capacity that can continue use up to about 3 hours each time. It produces "happy feeling" negative ions which help to lift your mood colorful changing LED light lamp, independent light-control. Unique desk lamp design - night light. Fits with any decor easily. It also adds moisture to your skin. 7-Color LED Lights. The light can change color or it can be set on one favorite color mode or turn it off. Use it as a night light in baby room or bedroom. Waterless auto shut-off. Ensure safety and save energy making it for trouble-free use at night. It will switch off when water runs out. The ultrasonic diffuser will not disturb your work/sleep. More versatile. Keep the nature of essential oil without heating. The diffuser eliminates pet odors, tobacco smells, etc. Without adding aroma oil, it can be used as a humidifier to moisturize the dry air, creating refreshing cool mist.