Germ Guardian H1000 Ultrasonic Cold Mist Humidifier. Unlike other humidifiers that grow slimy mold, the Table Top Ultrasonic Humidifier uses Silver Clean technology embedded in the tank to fight the growth of mold and mildew on the surface of the water tank. Thanks to ultrasonic technology it is ultra-quiet when it runs making it ideal to have on while you sleep. The perfect size to take when you travel. Stands only eight inches tall. The tank capacity is 875 mL and it runs continuously for over eight hours. There are no added costs since there are no evaporating pads, wicks or filters to clean or replace. Has a Low Water Indicator.