This is the only space heater that monitors the ambient temperature from the remote control, ensuring your preferred air temperature is maintained wherever you are located. When the temperature falls below or rises above the preset level, the remote control automatically sends a signal to the heater (up to 30' away) to increase or decrease the wattage and fan speed. Deeply pitched fan blades and a specially designed air duct create a vortex of warm air that circulates throughout a 256' sq. room, heating the air evenly from the floor to the ceiling and eliminating hot and cold spots. The heater uses only the necessary energy (between 750 and 1,500 watts) to achieve the preferred temperature, ensuring optimal efficiency. The remote also allows you to adjust heat output or set the timer with the touch of a button, and all functions can be changed using the heater's LCD touchscreen. Remote requires two AA batteries. Heater plugs into AC. 13" H x 12 1/4" W x 10 1/4" D. (7 1/2 lbs.)