This Air-O-Swiss AOS 7135 Advanced Air Treatment Systems Ultrasonic Humidifier is perfect for any room in your home. It features a digital display, quiet operation, water level window, wired, and tank empty indicator. The humidification method is ultrasonic and the power source is electrical. This tabletop model is great for whole room application and is a must-have for improving indoor air quality and maintaining a comfortable living environment. The product is from a well-known brand and is designed to provide advanced air treatment systems.