Uses Pure steam vapor restores moisture to dry indoor air. Helps relieve cold and flu symptoms. Up to 10 hours operation per filling. 1 gallon capacity (3.8 liters). Quiet operation. Healthful and convenient. Pure natural moisture. Automatic shutoff. Medicatio. Warnings KEEP OUT OF THE REACH OF CHILDREN. Carefully supervise young children when the vaporizer is operating. This unit provides hot steam and could cause burns.