1) There are two types: electric and gas type. You can choose the one you prefer. 2) It can aslo be used for roasting peanuts, sesame, grains, cashew nuts, sunflower seeds etc, it is multi functional. 3) It is full stainless stel. What is more, we can customized the rotary drum--stainless steel, not the iron. 4) For this machine, by reverse direction, it can pour out the materials. It is more convenient. 5) When roasting materials, you can also add some oil or salt to make different flavors.