Description:   1.Inductive、 no switch、 the cup will be light automatically、 when the water is poured into the cup、 and the light will be out when there is no water in the cup 2.Can hold all kinds of liquid、 like water、 beer、 whiskey、wine and so on 3.Usually the cup can glow lasts for up to 40 hours、 and changeable battery 4.Great for using at bar、 party、 evening、 convert、 disco and so on、 creative a cool atmosphere   Specification: Material: Acrylic Color: Colorful Capacity: 300ml Power By: 2 x 2025 Cell Batteries Size: 12x7x7cm\/4.7x2.8x2.8Inch   Package Includes: 1 x Inductive LED Wine Glass