How long can vacuum-insulated electric lunch boxes keep food fresh?

The preservation time of the vacuum fresh-keeping electric lunch box is generally between a few days and a few weeks ‌. The vacuum preservation electric lunch box extends the shelf life of food by creating an oxygen-free environment to slow down the oxidation process of food. The specific preservation time depends on a number of factors, including the type of food, initial state and storage environment ‌. For example, high-moisture, perishable foods such as fresh vegetables and fruits may remain relatively fresh for several days, while processed foods such as meat or ready-to-eat foods may be stored in a vacuum for several weeks ‌.

In addition, ‌ vacuum insulated electric lunch box holding time is generally about 4-5 hours ‌, different brands of insulated lunch box holding time is different. The better quality insulated lunch boxes can keep warm for 4-5 hours, while some can even keep warm for more than 10 hours ‌. The insulation effect of the insulated lunch box mainly depends on its design, usually in the ordinary lunch box with an external insulation shell, by reducing heat conduction, radiation and convection to maintain the temperature of the food.

To ensure the safety and freshness of food, it is recommended to follow the product instructions and relevant food safety guidelines for use. If you notice any signs of spoilage, stop eating the food immediately ‌