The ultimate container for lunches that you can take to work, travel, outdoor recreation, and any other place you'd like to; Ideal meal prep system for your busy lifestyle, Hot Bento offers unparalleled portability with upgraded electronics for added protection and water resistance; Stainless Steel food tray is built directly into device and coated with a non-stick surface to improve cleaning, safety and heating efficiency; Pressure relief valve equalizes pressure caused by steam and altitude to prevent vacuum and ensure easy opening of your Hot Bento Lunch box; Hot Bento is most effective when reheating food at room (68F) to refrigerated (38F) temperature; Hot Bento is not intended to thaw or reheat frozen foods and the charger is included