Features USB INTERFACE: With 5V 2A USB interface, this bag can be easily connected to power bank or mobile phone charger for charging, more convenient. AUTOMATIC THERMAL INSULATION: When heated to about 50℃, this bag will automatically switch to the thermal insulation state. ALUMINUM FILM LINER: The interior adopts aluminum film, which is dirt blocking and heat insulation, the stains will be clean once wiped. OXFORD CLOTH: The exterior uses oxford fabric, which is waterproof, not afraid of rain, adds more safety for outdoor travel. REASONABLE DESIGN: The pocket of power bank is designed outside the bag to avoid lunch box spilling and affecting power bank performance. Specification: Item Type: Portable Oven Bag Material: Oxford cloth Interface: USB interface (5V 2A) Thermal Insulation Function: Automatically switch to thermal insulation state when heated to about 50℃ Scope of Application: Lunch box insulation bag Package List:1 x Portable Oven Bag 1 x Connection Cable Package List 1 x Portable Oven Bag 1 x Connection Cable