- Ultrasonic aroma humidifier is the use of ultrasonic vibrate liquid water to produce water mist and emitted it to the dry air to air humidification. - It will envelop your surroundings effectively and brings a SPA like feeling to Home,Office,Bedroom,mall bedrooms,hotel rooms,Spa,Yoga stabletops and even workplace cubicles,relaxing yourself from a long day working. - Just need 3-5 drops of GX.Diffuser essential oils into the water,you can feel the fragrance and have a good mood and a better sleep,relieves depress after a whole day work. - Items auto-off if there do not have enough water.