Vornado DVTH Whole Room Vortex Heater, Automatic Climate Control Vortex technology fully circulates warm air evenly throughout the whole room Automatic climate control adjusts heat output and fan speed to maintain set temperature Digital display with push-button controls featuring 2 heat settings and fan-only mode Advanced safety features including tip-over protection and automatic safety shut-off system for worry-free use Assembled in the USA, whisper quiet operation and backed by a 5-year limited warranty Built to meet U.S. voltage requirements. Certified, safety-tested, and warrantied for use only in the U.S.