12V/24V charging power cord for car lunch box and rechargeable lunch box. Made of plastic material. Put this Portable Food Warmer in your backpack. It's super lightweight and has no burden to carry. This is portable freezer refrigerator for dc power cable,used for car freezer refrigerator. You can heat food at any for time. Great choice for truck drivers,railroad workers,flight attendants,office workers,patrolmen,and so on.