Do you hear that? No because the Dr. Browns Ultrasonic Cool Mist Humidifier with Nightlight has a whisper-quiet operation and comfort lighting perfect for the nursery. This air humidifier features a built-in nightlight that offers 3 brightness settings. Adjustable humidity control sets your surroundings to your exact comfort level, while the large 1 gallon (3.8 litre) tank keeps it that way for up to 30 hours. A great baby humidifier for nurseries, the automatic shut-off offers you the freedom to set it and forget it. Easily fill the tank, secure the leak-free valve and point the ultrasonic humidifier anywhere you want with the directional mist nozzle. The Ultrasonic Cool Mist Humidifier offers a filter-free experience and includes an optional, removable wick for essential oil aromatherapy. Essential oils not included.