The EVDC500 whole-room, two-tank evaporative humidifier is driven by a Energy Smart DC motor that is more powerful and uses 90% less energy versus a comparable Vornado Ac motor-driven humidifier. The minimalistic design features a clear, easy-fill 1-gallon tank that is simple to use and maintain, with a low-water indicator that shows when it's time to refill. Customizable humidity settings paired with precise auto humidity control allow you to tailor the natural evaporation process. The EVDC500 ensures a comfortable breathing environment with the peace of mind of a 5-year satisfaction guarantee and 10-year motor warranty.