Envion Therapure Ultrasonic Humidifier DUAL ACTION COOL & WARM ULTRASONIC MIST provides healthy, moisturized air and helps reduce flu viruses THERASILVER HOUSING inhibits germ growth on the removable water tank LCD COLOR DISPLAY indicates when water tank is empty or when cleaning is recommended 360 DEGREE MIST ROTATION 3 mist output levels and 1.6 gallon tank size