This Comfort Zone Ultrasonic Aromatherapy humidifier makes it easy to add moisture and fragrance to dry air. Perfect for a desktop or nightstand, this whisper-quiet ultrasonic humidifier emits a soothing, fragrant, cool mist to relieve the discomforts of nasal congestion, itchy skin, chapped lips, and dry throat. It features digital controls, 3 adjustable mist levels, and a top-fill tank to easily fill with water. This humidifier comes equipped with a lower tray that has a reusable fragrant oil sponge and built-in aromatherapy diffuser so you can add your own oils for aromatherapy, creating a calm and stress-free environment. Simply fill the tank with water, and it works for up to 26 hours, then shuts off automatically when it's empty. The auto-shutoff features also work when the water tank is removed from the base. This easy to clean humidifier with visible cool mist is perfect for small to medium-size rooms.