1. Do not place it near the fire source. Do not use a hard brush or abrasive powder to scrub. 2. Do not enter the microwave oven for heating. 3. When storing carbonated or fermented food for a long time, the sealing effect will be reduced. 4. When the cup is filled with water, the air in the middle of the double-layer cup is heated and expanded, and light mist will appear, which is a normal phenomenon. After the temperature drops, the mist disappears. 5, the size of the lid should be tightly closed to avoid water leakage. 6, water temperature when the water temperature is better, to prevent burns!