Color Changing Mug Is The Mug Which Changes Color. It Is Temperature Sensor. When You Pour Hot Coffee / Tea Or Icy Cold Beverage, The Design On The Surface Of Mug Will Be Changed To Another. Bring The Amazing Surprise To People, So We Also Call It Magic Mug.good looking design keeps drinks hot or cold and makes your travel perfect.Textured, non-slip sleeve; will fit standard cup holders.It looks so normal at the first sight, however, the surface of the mug is coated with a special coating which turns to be transparent when 40-50 Degree water or other liquid is poured into the mug. When the special color coating becomes transparent, your personalized pictures beneath will appear.