The Optimus Cool Mist Ultrasonic Humidifer has a 1.5gallon tank capacity that outputs 2.0 gallons of moisture in an 18 hour period. The clear removable water tank allows for easy refilling while the auto shut off feature will turn the humidifier off once the water source has been depleted. This humidifier features a whisper quiet operation so that you can sleep peacefully without interruption.
