X13 ultrasonic humidifier has a large 6-liter tank that allows users to humidify continuously for up to 50 hours, saving you the trouble of frequent refills. We have chosen a practical design of removable cover for this humidifier. No need to flip upside down, the top-fill humidifier makes cleaning and refilling quick and spill-free. X13 ultrasonic humidifier have large touch panel and remote control that you can adjust the machine freely.