The advanced and intelligent Boneco U350 Ultrasonic Warm & Cool Mist Digital Humidifier, Top-Fill gives you the option of either warm or cool mist humidification. Enjoy all the updated features, including a digital display and AUTO Mode. AUTO Mode automatically humidifies room air to an optimum 50% relative humidity. This process is measured by the built-in humidistat and can be set to your desired humidity level at any time. The U350 cool mist or warm mist humidifier lets you choose the right type of mist for your needs. It delivers up to 3.17 gallons of moisture per day and is great for use in any season. Use the U350 during winter when heaters dry out the air or during summer when AC units remove all moisture from your home. Refilling Is Easy with the Boneco ultrasonic humidifier. Different from other humidifiers that require constant removal of water tanks, the U350 features a convenient and user-friendly top-fill design. This design allows you to simply open the top of the humidifier and pour water directly into the tank. Further advanced features for the Boneco U350 warm mist humidifier include the new and improved LED Digital Display. This display provides an overview of all functions and maintenance instructions. Other Added Benefits in addition to its user-friendly top-fill design, include its 650 square foot coverage area and convenient essential oils compartment (oils not included). The U350 humidifier also comes with an A250 Aqua Pro filter that helps to reduce water hardness. Find out how balanced humidity can enhance your life and keep your home free of static and dryness, the Whisper Quiet Ultrasonic Mist Humidifier from BONECO ensures your atmosphere is calm and comfortable all year long.