This Digital Warm & Cool Mist Ultrasonic humidifier uses high-frequency vibrations to turn the water into a micro-fine mist that creates a comfortable environment in any room. Choose the pre-heating function and mist exits the appliance at a pleasant 104 �F. �ITC�� technology (Intelligent Temperature Compensation) monitors the temperature and automatically adjusts the output when conditions change. A replaceable demineralization cartridge (Ag+ Ionic Silver Technology) ensures a water mist without lime scale or mineral residues. The included Hydro Stick keeps the humidifier clean and fresh longer. Humidifiers are important because asthmatics are super sensitive to the air that they breath. They cannot help it. This is because even the slight lowering of the quality of the air that they breath will already put them into fits. With an Ultrasonic humidifier, they are in for a good time.