Harmony LED Ultrasonic Aroma Diffuser features ultrasonic technology cold diffuses essential oils as a fine micro-particle mist. Purifies air, generating negative ions to remove pollutants, bacteria, fine dust, smoke and viruses. Helps to relieve depression, stress, fatigue and allows for better sleep. 3 mist options, 7 LED light color, locking light color of choice or cascading option, up to 6 hours quiet use and auto shut-off. Water capacity 150 ml. Essential oils not included. Color: Multi-Colored.