USB power Bank Food Heating Lunch Box Waterproof Insulated 5V Car Picnic Food Warmer Container Bag Electric lunch box Bag It is very suitable for children to carry when they go to school / white collar / family camping. When the food is cold, just plug in the power and heat the food, which can increase the taste of the food. Hot food is easier to digest. Do not use products with thermal insulation properties, because they have the effect of isolating temperature and cannot heat food. If it is a product with thermal insulation properties, please open the lid so that the food can be heated more fully Universal USB plug, plug and play, suitable for power bank, car, computer and other USB plug. When it is heated to 50°C, it is at a constant temperature of 50°C, so there is no need to worry about it burn out. Colour: Black Material: Oxford cloth Perfectly suitable for the heating needs of lunch box and all kinds of food, no longer eat raw and cold food. Function: 50°C Constant Temperature