Seal & Store Lid Leak-proof seal gasket is installed on the lid for a better seal to prevent liquid food spill out during bumps. Electric Lunch Box Food Warmer 300W 110V for wall plug, double layers 800ML slow cooker heated lunch box. Each 304 stainless steel container is equipped with a plastic cover (can not heating).That is perfect for taking your favorite leftovers, soups, chili, and more, then easily warming them up when you're ready to eat. Easy to Use Get it plugged 20mins to 40mins before mealtime for heating, you will be able to enjoy hot home-made food in the office, or other place without kitchen. Dishwasher-Safe 304 stainless steel container and inner lid are dishwasher-safe for easy cleanup.