Feature:1. USB Heating: USB heating, you can use a power bank, you can also use a mobile phone charger, with its own charging cable.2. Water Resistant Oxford Cloth: The lunch box is distinguished from the charging treasure bag, and the water resistant Oxford cloth is used, which is not afraid of rain.3. Internal Aluminum Film Design: Portable ovens have internal aluminum film design, and the stains are wiped clean, which is convenient and fast.4. Lightweight Handheld: Portable food warmer can provide you with hot food, portable, so that your stomach is no longer hurt.5. Glossy Opening: The self contained socket is more convenient for heating, high durability zipper, the opening is glossy, and the bite is tight.Specification:Item Type: Lunch Bag Portable OvenMaterial: Oxford Cloth, Aluminum FilmProduct Size: Approx. 20 x 15.5 x 8cm / 7.9 x 6.1 x 3.1in(Manual measurement, there will be 1-2cm error).Package List:1 xLunch Bag Portable Oven1 x Charging CableNote:The product needs to use 5V 2A power supply.This product can only be heated up to a maximum of 50C. After heating, it will automatically turn into a heat preservation state, and it takes about 20 minutes to heat up to 50C.