1, whether the electric lunch box is water-free or heated depends mainly on the actual situation.
2, waterless electric lunch box, that is to say, it can only be heated, generally at a constant temperature of about 70 degrees. The main function is to heat dishes. It is also relatively simple, light and compact in structure. This one below is water-free, heated lunch box. Very small.
3, water-heating lunch box, water-heating lunch box has many functions, generally adding water at the bottom, heating food by steam, you can imagine it as a small rice cooker. Because the bottom needs to be filled with water, this kind of lunch box will be slightly larger, generally with a double-layer structure, which can steam some simple meals.