The Vicks Starry Night Cool Moisture Humidifier provides soothing, cool, invisible moisture and a calming environment to help your child sleep. The V3700P features a projector screen that transforms you child's room into a starry night sky. Its scent pad heater produces soothing menthol vapors for added comfort. Features: The tank has a 1.0 gallon capacity that runs up to 24 hours per filling Vicks VapoPadTM Scent Pad Heater Projector is independently controlled Self regulating evaporative system that naturally adjusts output to amount of moisture the air can hold at a particular temperature 2 speed settings Designed for medium sized rooms 3 year warranty Use with replacement filter: WF2