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he vacuum flask use vacuum insulation technology .Stainless steel as the main raw material, using a vacuum formed in the inner and outer bilayer cup wall to block the inner and outer heat transfer vessel。It is possible for a long time to maintain the temperature within the container with The temperature sensor in the bottom of the bottle able to measure the temperature of the liquid bottle, and reflected by the bottle's display. We can have an intuitive understanding of the temperature of the liquid through the color of the bottle display.