With its convenient smart features, aromatherapy, and ultrasonic technology, the Levoit Humidifii Smart ultrasonic cool mist humidifier delivers humidity to offices, nurseries, and other mid-sized rooms for up to 40 hours. With the free VeSync app, you can enjoy full control of your humidifier from your phone. You can also monitor your room's humidity and create schedules and timers. With an effective range of up to 370 sq. ft. (33 sq. m), it covers virtually any room in your house. The near-silent noise levels help you sleep, while the mist provides relief from dry skin, allergies, and cold symptoms. 1. 25 gal. ultrasonic cool-mist humidifier delivers humidity to offices, nurseries, and other mid-sized rooms for up to 40 hours. Dimensions: 14"H x 7. 98"W x 5. 97"D. 1-year manufacturer limited warranty. Features sensor control button. Covers rooms up to 370 sq. ft. Simply add two to three drops of essential oils to the aroma pad to turn your humidifier into a diffuser. Monitor your humidity, select settings, and create schedules and timers for your humidifier with the VeSync app, so it always turns on/off at the right moment