Features:100% brand new and high qualityInductive light， when the cup is filled with liquid， the LED light will turn on automatically;Clear transparent， At the bottom of the prism surface design， make the light more beautiful and charming;No-toxic， Durable， shockproof， impact resistant;Perfect decoration for your party， pub and discos.Specifications:Material: AcrylicLight: 5 LEDsCapacity: 200-300mlSize: Opening diameter 2.75" (7cm) / Height 3.42" (8.7cm) Power: 2 x 3V CR2025 Button Battery (included)Duration: 10-40HWeight: about 125gThe batteries of the item are replaceable!Color: the color of the light is change automatically.Water activated: It glows automatically when drinks are added， turns off when there is no liquid left.