Ultrasonic Cool Mist Technology: Safely hydrates the air, allowing you to breathe easier and get more restful sleep. Ideal coverage for bedrooms, offices and other medium-sized rooms. Year-round comfort: High and low speed settings combined with 360° spray nozzles help you balance and regulate your home’s humidity all year round to relieve cold symptoms and sinus problems. Great room coverage: this 1.5 liter (0 .4 gallon) has room coverage up to 250 square feet, perfect for bedrooms, living rooms, offices and nurseries to safely moisturize the air. Night light and auto shut-off : An optional nightlight provides a soothing glow, while an auto shut-off feature turns the humidifier off when the water level is low or the tank is removed.