Heat your MRE pouches safely and quickly without fire, as they are designed specifically to be used with your MRE's to heat them anywhere, anytime. By just adding water to the heater and inserting the sealed pouch of food into the bag, you will have a 100+ degree meal in 10 to 12 minutes! Exactly what our troops are using in the field! The heater is a simple combination of powdered food grade iron and magnesium, salt, and water. When water is poured onto the included heater pad, the heater releases enough heat to warm-up the pre-cooked meal to 100+ degrees Fahrenheit in approximately 12 minutes.