Eware 3K037 Cool Mist Ultrasonic Humidifier with Whisper-quiet Operation, Automatic Shut-off Ultrasonic cool mist technology safely moisturizes the air for up to 10 hours of continuous operation so you can breathe easy and get more restful sleep 1.4-liter tank capacity provides ideal coverage for bedrooms, offices, and other medium-sized rooms Adjustable mist level make it easy for different room moisture needs Automatic shut-off safely turns humidifier off when water level is low or the water tank is removed Newest technology for a whisper quite operation. Hassle Free to use during bedtime