It uses infrared light heats the air to the preset temperature. The fan blows the hot air evenly to all sides of the food for efficient cooking. I had one for more than 2 years now. I made a number of "Peking ducks" and many other dishes in it. It can be bought at many stores now. The lowest price is $40. The one shown seems to have program controls for cooking different dishes. The $40 ones needs some experience to set the cooking temperatures and times for different food.