100% Brand new and high quality! Flash mug is not only popular in nightclubs KTV bars and other places, when you use the flash mug will be let you become more attention and special. And flash cup, but also by the children’s favorite, gorgeous colors attract attention. Inductive light. Light is on when the cup is filled with liquid (water, drink, alcohol etc.). Filching rhythm is changeable automatically. Light is off when no liquid is filled in. Cleaning with water. When the cup has no water, the cup will not shine!