ULTRASONIC TECHNOLOGY: The Aspire Cool Mist humidifier utilize advanced ultrasonic operation. This feature uses vibration to create water vapor instead of heat, making it safe and efficient humidifier without the risk of overheating. Providing a comfortable environment any room of the home or office. SINGLE BUTTON CONTROLS: Easily operate the Hunter Fan Company Aspire Cool Mist humidifier with its single button controls. Push once for low setting, twice for high setting, or three times for off. Color-coded LED- green on low, blue on high Red LED to signal water level low. EASY TO CLEAN: No need to clean the Hunter Fan Company Aspire Cool Mist humidifier with harsh chemicals- simply use a vinegar and water mixture once a week to avoid mineral build up and help ensure the humidifier is running effectively. TABLETOP DESIGN: The Aspire Cool Mist humidifier allows you to conveniently add water without the need to move the humidifier. Also its small footprint fits great in small spaces such as on tables, counters, and dressers. ESSENTIAL OIL TRAY: With its convenient essential oil tray, you can use the essential oil of your choosing with the Aspire Cool Mist humidifier to help elevate the scent in any room of your home. (Essential oils should never be added to the water directly.)