Temperature up to 250 degree celcious. Heating elements are placed in ribs at the bottom and sides. Double walled inside Anodized AluminiumStainless Steel. The door has synthetic rubber gasket. Outside mild steel painted in epoxy powder coating with perforated adjustable shelves, two indicators and OnOff switch. To work on 220230 volts A.C. with OR without one number Air Circulating Fan & Digital temperature controller cum indicator