Cool/Warm Mist Ultrasonic Humidifier with UV Built in ultraviolet light reduces germs and bacteria in the water safely and effectively Ultrasonic technology allows for virtually silent operation while Cleanmist technology prevents microbial growth on the surface of the water tank Runs up to 32 hours per filling with convenient LED "refill indicator" light No filter to worry about, clean or replace with easy-fill 1.6 gallon tank capacity with 1.4 gallon output per day Features night light, 24 hour timer and auto-shut off and an included Demineralization Cartridge for hard water and white dust elimination