This unique aromatherapy diffuser is wonderful for both adding humidity to the air and dispersing your desired scent of essential oil to enhance your room's atmosphere. The ultrasonic nebulizer transforms water and essential oil into a cool mist. This diffuser also includes output adjustment buttons for a low or high mist and has a safe auto off feature when the water runs out. This diffuser has a whisper quiet operating system so it can be used both at night and during the day. This unique aromatherapy diffuser offers a lighting feature to create a relaxing therapeutic mood or can be used as a night light. Large capacity reservoir holds 600ml of water for 10-18 hours of operation. Portable water tank for easy refilling. Automatic shut off when water is empty. For use in a therapeutic atmosphere or home use.