The LW45 Comfort Plus Humidifier humidifies dry room air in spaces up to 645 square feet (with standard 8-foot ceilings) using evaporative humidification. The digital touch display offers intelligent control, with auto-mode, sleep mode, and convenient service indicators. Tap to switch on or off, and select between three power levels using + and –. Sleep mode will automatically dim the display and reduce the fan speed to allow for a restful night of sleep. Auto mode will automate the power level based on the desired target humidity level. Thanks to the integrated hydrostat, the display indicates and controls the air humidity in real-time. This compact 2.6-gallon evaporative humidifier is powerful enough to work with indoor spaces up to 645 square feet, making it ideal for a master bedroom, living room, or large open rooms. Equipped with auto shut-off and low water indicator, this unit also features the ability to select the desired humidity level between 30% to 70% in 5% increments.