This is a simple white ceramic cup, but it is really not common. It is a ceramic mug with a color changing thermometer on. When there is cold water or no water in the cup, it shows black while when you fill it with hot water, the black scale will change into the red very quickly. Add your hot beverage and watch the fuel gauge climb. This mug shows gentry and concise. Its capacity is 200-300ml. Its diameter is 7.7cm while its height is 9.2cm.