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. style: B-classic USB heated lunch box size: about 21 x 16 x 8cm Material: Oxford cloth colour: Black Package Contents: 1 x Electric Thermal Lunch Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the