promotional gifts mini car &usb lunch box warmer,lunch tote warmer,USB gadgets Be used in car and used in door with USB also promotional gifts mini car &usb lunch box warmer,lunch tote warmer,USB gadget.Heated the food such as the rice,bread,Pizza with USB power or automobile power.Heated the food in 0.5-1 hour in car.Heated the food in 1-2 hours in door with USB(before heating,please take the ...