This electric lunch box containing 4 insulated liners possesses 2 layers and 2 capacity in total. it is ideal for cooking a variety of foods and ingredients such as heat preservation, steamed rice, noodles, porridge, steamed eggs, dessert; suitable for both household and traveling. it adopts steam circulation heating to make the food is cooked thoroughly, and the ptc heating achieves equilibrium heating, which is safe and healthy to use. features: put about 300 ml of water in the lower compartment of the lunch box. otherwise, the lunch box will not work. press the power button. the lunch box will heat or cook food quickly. after the water used for evaporation is completely boiled, the lunch box will automatically close.