The Air-O-Swiss Travel Ultrasonic Cool Mist Humidifier 7146 is a high quality travel-size ultrasonic humidifier which is compact enough to take and use anywhere. The efficient ultrasonic technology uses high-frequency vibrations to generate a micro-fine cool mist, which is blown into the room where it evaporates into the air. Just add your own half-liter water bottle, and plug the unit in anywhere in North America or Europe using the included transcontinental travel AC adapter and exchangeable plugs. Stay healthy and be more productive at home, in your dorm room, or at work. Place the AOS 7146 on your desk, in your office, in your hotel room, or anywhere you need quick and easy added moisture.