Lite smell USB Diffuser Air Humidifier is a cup-shaped diffuser and humidifier. Ultrasonic technology ,with lightweight and compact design also with big capacity 150ml. Add water and 2-5 drops of essential oil into the water tank, gives the ultra-fine/smooth uniform aromatherapy mist, it envelops your surroundings effectively, to add moisture reduce dry skin, improve breathing problems and relieve stress.