Main Features:Made of acrylic、 highly resistent to high temperatureTransparent like a glass cup、 however、 it is far more sturdy and durable than a glass cupBuilt-in press sensor at the bottom、 easy to flicker with 7 colors in turn when poured water in itButton cell batteries at the bottom are waterproof、 but do not soak in water long timePowered by 1 x button battery (included)、 it is removable、 light can be glowing for 30 hoursPowered source: BatteryMaterial: AcrylicFeatures: SensorLight Color: ColorfulPackage Contents: 1 x Water Sensor Pineapple Shaped Flashing Party Acrylic LED Light Cup