To My Wife or Husband, I loved you, Color Changing Mug Color:wife 55V button cell

55V button cell

Built-in locking system: The middle disc needs to be turned to the designated position to open this puzzle

There’s also a slightly different version called the HIENJOY

A creative fusion of science

Excellent toy to make fun and make others scary

To My Wife or Husband, I loved you, Color Changing Mug Color:wife 55V button cellThanks to its heat sensitive coating, which reacts to the heating of the ware, the mug changes its color from black to lighter color in an amazing way. When the mug is cold, its color is black, and the image is hardly noticeable. But when filling it with hot drinks tea, coffee, milk or water, its color becomes lighter and the printed image gradually appears. Features: When filled with hot liquid, Wake up. Heat sensitive material on the mug surface