Air Innovations 2.15 Gal. Ultrasonic Cool Mist Dual Tank Digital Humidifier with Aroma Tray for Large Rooms &ndash; Up to 700 sq. ft. Black Permanent Ceramic Filters  Never Needs Replaced Anti-Microbial Tank & Base - Freshen your space with pure, clean moisture Runs Up To 120 Hours On One Tank Designed to operate quietly for uninterrupted sleep 5 mist settings, Rotating mist nozzle, Adjustable humidistat, and more!