HU00-19054NBC, Blue: Run Time: Up to 60 hours.(Run time is calculated based on using cool water and setting the mist level to the low setting. Based on the natural humidity level in your home, the temperature of water you use, and the mist level setting you choose, you may experience longer or shorter run times.) Moist air feels warmer, so you can set your thermostat lower while still feeling warm and comfortable. Humidifiers offer many benefits to your environment, making your home a more comfortable and enjoyable place throughout the year. Night Light: warm yellow light. Technology:Ultrasonic Reduces static electricity, benefiting people, computers and home electronics. Auto Shut-Off Protection: When the tank is empty the unit will shut off automatically. Capacity: 1 gallon Consistent moisture helps to protect wood floors and furniture, and indoor plants. Coverage area: 372 sq ft