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This is a device for controlling the space between two shelves inside the refrigerator. When you want to adjust the shelf up or down，you do not need to take the food which have been put on the shelf out of your refrigerator. Only pressing the number keys and then turning the rotary knob could you make the shelf higher while lower.
Rails in the inner wall of your refrigerator always connect with air cooling circulation system so that it could make perfect temperature and humidity control and keep food refrigerated well
If you want to move more than one shelf, just press the corresponding number keys and then turn the rotary knob.