This humidifier has a 1-gallon tank, providing up to 24 hours of continuous use. It helps relieve cough and congestion symptoms. Easy to use with a filter-free design and compatibility with Vicks VapoSteam for medicated vapors. The price drops from $39.99 to $29.99 to just $28.49 with Subscribe & Save. Shipping is free for prime members or on orders over $35.

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