The Honeywell Dual Comfort Cool + Warm Mist Humidifier with Fusion Mist technology fills your air with refreshing moisture to help relieve dry air discomforts and also lets you choose and customize your comfort. It is a cool mist humidifier and a warm mist humidifier, giving you the flexibility to choose your temperature based on personal preference or as weather changes. Fusion Mist Technology boils water and fuses it with cool mist to generate the ideal warm mist temperature. During cold and flu season or when the air is simply just dry, you can rely on this humidifier for your entire family. It also includes an essential oil cup (oils not included). Both mist temperatures add necessary moisture to the air, and help ensure proper humidity levels in your home. Indoor humidity levels between 40-60% can help relieve cough and congestion, keep throat and nasal passages hydrated, temporarily relieve dry air discomfort, protect furniture, reduce static electricity and even keep plants healthier. It also has 3 mist settings each for cool and warm, a digital humidistat, 2-direction mist outlet, and is ideal for large-sized rooms. It has no filter to change, a wide tank opening for easy cleaning and up to 36 hour run time.