This Electric Heating Lunch Box is made of food grade PP material and stainless steel, which is environmentally friendly and nontoxic, so it is good to health. The stainless steel container is removable, therefore it is very easy to clean. And there is also an individual box, which is very convenient to separate different dishes. The lunch warmer is very convenient to take your meal with you. And the waterproof design of the plug port can keep it from the water while not heating, very safe.