Principle of color change: The outer layer of the cup has a kind of special color change material, When the temperature changes, the color change material, resulting in phase pattern change.
For taking in liquid such as water, tea, ect.
Note: 1.The lamp does not light when hot water is not added. 2.Please allow 1-3cm errors due to manual measurement. 3.Due to the difference between different monitors, the pictures may not reflect the actual color of the item.