Vornado HU1-0016-14 Air Softener Three in one system- Humidifes, filters, and circulates Unique vortex action for maximum output performance, heat recovery and evenly distributed humidifcation Energy savings. Maximizes the performance of a home's current heating system Personal comfort level is maintained by moisture control and 3 fan speeds Rugged indestructible bottles are the easiest to carry and fill. A visible water level indicates when refilling is necessary