PureGuardian H965 Ultrasonic Cool Mist Humidifier for Bedrooms, Baby Nursery, Quiet, Filter-Free, 1 Gal Tank, 70 hr, Treated Tank Surface Resists Mold, Pure Guardian Humidifier with Essential Oil Tray A 1 gallon tank provides up to 70-hours of run time and is great for medium sized rooms Silver Clean Protection fights the growth of mold and mildew on the surface of the water tank Ultrasonic Technology quietly disperses a fine mist providing relief from the dry air Optimize comfort with soothing low and high cool mist settings Aromatherapy Tray option helps create a relaxing environment with your favorite essential oil. Oils not included