Electric Lunch Box Pluggable Heating Single / Double Layer Insulation Office Workers Portable Hot Vegetable Cooking Bento Lunch Box Features: 1. This insulated, reheated lunch box works quietly without bothering, enjoying delicious food without being disturbed. 2. This insulated lunch box adopts steam circulation heating mode, so that the food will not be cooked, and heat more evenly. 3. This insulated lunch box adopts negative pressure sealing preservation technology, which can better preserve food and keep it fresh without deterioration. 4. This insulated lunch box has the function of preventing dry burning. When working, it will start the protection of preventing dry burning when meeting the problem of water shortage. 5. This kind of lunch box is small in size, convenient to store and take up no space. The handbag is designed to be carried Specifications: Material: Plastic + Stainless Steel Color: White Way to Control: Button Number of Layer: Single / Double (Optional) Capacity: 1L / 2L (Optional) Plug: EU / US (Optional) Voltage: 220V / 110V (Optional) Rated Power: 200W Rated Frequency: 50HZ Package Size:  Single Layer: 25.6 * 16.2  *13.6cm / 10 * 6.3 * 5.35in Double Layer: 35 * 16.2  *13.6cm / 13.7 * 6.3 * 5.35in Package Weight:  Single Layer: 900g / 1.98lb Double Layer: 1381g / 3lb Note: Please read the product manual carefully before use. Package list: Single Layer: 1 * Box 1 * Manual 2 * Bowls Double Layer: 1 * Box 1 * Manual 4 * Bowls