The first generation of microwave ovens used mechanical side door, and the microwave oven door could be opened and closed freely by pressing the button lightly. The advantage of this door opening method is that there is no obstruction between people and the furnace cavity, and things can be taken at close range, which is convenient and free.

The second generation microwave oven is turned on by a semi-pull-down door. This opening method is very suitable for families with small rooms and low desktops, because it can save space and is generally popular in Japan and South Korea.