What functions do the Double button designs of the Double-Button lunch box correspond to respectively

　　The Double-button design of the double-button lunch box usually has the following functions:

　　Enable function

　　The first button is generally used to unlock and open the upper cover of the lunch box. When this button is pressed, it will release the locking device between the lunch box lid and the box body, allowing the lid to be opened easily. This design can prevent the lunch box from being accidentally opened during carrying, ensuring that the food does not spill out. For instance, when office workers commute with lunch boxes in their backpacks or students go to school with lunch boxes in their schoolbags, even if the lunch boxes are squeezed or bumped, as long as the open button is not pressed, the lunch boxes will remain closed to ensure the integrity and hygiene of the food.

　　The second button may have multiple functions related to opening. For example, the second button of some lunch boxes is used to open the partition layer inside the lunch box. Many Double-button lunch boxes have multiple compartments for storing different types of food respectively, such as main courses, side dishes, fruits, etc. By pressing the second button, the specific compartments can be conveniently opened to take or place the food without affecting the food in other compartments. Such a design helps maintain the classified storage of food and avoids the mutual contamination of flavors among different foods.

　　Sealing function

　　The dual-button design also plays an important role in sealing. The first button may trigger a sealing mechanism when closing the lunch box. When the lid is closed, pressing this button can form a tight seal between the lid and the box body, preventing air, moisture and odors from entering the interior of the lunch box, thus better maintaining the freshness and taste of the food. Take summer as an example. Put the cooked meals in lunch boxes. If they are well sealed, it can effectively prevent the food from going bad within a few hours.

　　The second button might be related to enhancing the seal. For instance, it can further press the sealing ring inside the lunch box or activate some additional sealing devices, such as locks, to ensure that the lunch box achieves a higher sealing level. This is particularly important for carrying foods with a lot of soup. Even when the lunch box is tilted or inverted, it can prevent the soup from leaking.

　　Other functions

　　The Double-button design of some double-button lunch boxes may also have some unique functions. For example, the first button can be associated with the heat preservation function of the lunch box. After pressing this button, the insulation layer of the lunch box may be activated. Through some special materials or techniques, the food can be kept warm for a longer time.

　　The second button might be related to portability. For example, pressing it can pop out a portable handle, making it convenient for users to carry lunch boxes. Or it can control a storage device on the outside of the lunch box to store small items such as tableware, making the lunch box more practical and convenient.

　　The Double-button functions of double-button lunch boxes of different brands and models may vary, but generally, they are all designed around aspects such as convenient use, ensuring sealing and enhancing practicality.