Sitewide Savings - 20% Off Sitewide + Free Shipping with Rebate! Promo Code: SAVE20Dual tank ultrasonic humidifier uses Clean Mist Technology to prevent microbial growth on the tank surface ensuring clean cool mist. 1.6 gallon tank with refill indicator LED light and auto off protection. Features an easy-read digital display for precise humidity control. Includes demineralization cartridge for hard water and white dust elimination. 24 hour timer.