Vicks Ultrasonic 1.2 Gallon Cool Mist Humidifier, Model V5100n 1 Ea Quietly Delivers Ultra Fine Visible Mist . Quiet Output Won't Disturb Sleep. Recommended for Medium / Large Room Size Tank Handle - Tank handle for easier lifting and filling. Translucent Water Tank - Translucent 1.2 gallon water tank shows water level. Operates up to 24 hours per filling. Power Switch - Power switch with multiple humidity levels. High for maximum comfort or larger rooms. Low for moisture maintenance in average rooms. Fine, Visible Cool Mist . Adjustable Mist Control