Product parameters: Material: high borosilicate glass + food grade PP box cover + silica gel Performance: high and low temperature resistance / vacuum sealing / no odor Product name: high borosilicate glass vacuum lunch box Capacity: Two compartments: large 1380ml/medium 980ml Applicable object: Adult Evacuation method : ①Press to extract air (simple and convenient, suitable for short-term storage) Press the air pump repeatedly for about 6-10 times. At this time, the center of the vacuum valve button is recessed to indicate the vacuum state. ②Pump pumping (high vacuum, suitable for long-term storage) Place the suction pump close to the vacuum valve button vertically and repeatedly pump for about 6-10 times. At this time, the center of the vacuum valve button is sunken to indicate the vacuum state. Precautions: ①. Remember to remove the lid of the lunch box when heating in the microwave to avoid deformation caused by high temperature heating. ②. In order to prolong the service life, it is not recommended to wash the vacuum hand pump, but can be wiped with a clean damp cloth. When cleaning, the hand pump should be disassembled, and the other parts can be washed and cleaned.