Come and Check Our Branding Solutions.The electric lunch box is made of food grade 304 stainless steel +PP material, and the bottom of the food heater lunch box is designed with aluminum plate, 360 degree heating cycle. The outer shell is food-grade safe plastic, so you can use it with confidence.Portable Microwave,Fast heating and keeping food warm. The heating lunch box adopts constant temperature PTC heating, which will always keep the constant temperature at 175 Fahrenheit, so that your food will always remain warm.This food warmer heater has 2 power adapters: 110V household, 12V/24V cars and trucks. Pls check inventory and detailed info before placing your orders.