Product information:

Product material: PS plastic (food grade),safe to use.
Packaging: Color Box
Luminous duration: about 20 hours
Battery: 2 CR2025 button batteries (built-in)
Adding water will emit colorful lights, suitable for various celebrations, bars, nightclubs, and other occasions.
Feature: This is cool! This is cool, whether it's a bar, dance hall, dinner party, or romantic candlelight dinner; When the drinks in the cup also emit dazzling rainbow lights, it is a feeling of charm, mystery, and even freshness!

Specification: Diameter 8.1cm * Height 12.8cm (12oz)

Detailed description:
Ordinary cups lack uniqueness and passion, but our cup comes with a built-in colorful lighting module that, when turned on, is incredibly dazzling;
The drinks in the cup will appear even more dreamy and intoxicating due to the lighting!
Pour the water into the cup and it will light up. Without the water cup, it will not light up.