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 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, 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 50C, it is at a constant temperature of 50C, 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 eat raw and cold food. Function: 50C Constant Temperature Heating Plug Type: USB Size: 21 X 16 X 8cm Weight: 0.2kg Package Contents: 1 X 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.