Different heating lunch boxes have different uses, some of which are quite complicated and the cleaning is also very complicated. I was afraid of trouble, so I bought a simple lunch box called Dongling heating. Put the rice in the lunch box in the morning and insert the rice cooker directly at noon. Simple operation, but not simple performance. This kind of lunch box heats food at a constant temperature, which can heat the inside and outside of the food well and will not make the food paste evenly. The heated food is delicious and the entrance is quite touching.