Essential oil Ultrasonic Humidifier Mist Control Aromatherapy Diffuser with 7 Color Changing LED Lights for Office & Home. 100 ML - Tank Capacity. Functions as both cool mist air humidifier and diffuser. You can use this with aroma oil as humidifier for room. Inspire high spirits to set a positive atmosphere for business meetings and social gatherings. Refreshes the quality of air. Also works as a night lamp.