This Diffuser is perfect 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. It also includes output adjustment buttons for a low or high mist and has a safe auto off feature when the water runs out. Offers 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!