- Amazon.com offers the Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier for $21.40.
- Free Shipping on orders over $49.
Features: 1.11 gallon tank capacity. Output of 1.5 gallons in 18 hours. A water empty automatic shut off switch and refill light. Adjustable mist volume control. Whisper-quiet operation; won't disturb sleep
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