Filter free, ultra quiet, cool mist comfort without sacrificing style! Textured metal control wheel adjusts the mist output level. Water level is visible through the water window, and an independent tank light can be set to bright/dim/off. Add a few drops of your favorite oils to the Essential Oil Tray for added comfort. The 1.25 gallon tank features a wide opening that is easy to fill and clean, making it a great choice among air humidifiers for bedrooms and nursery humidifiers.