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Specification: Color: transparent Product capacity: 285ml/10oz Type: Luminous Cup Light color: red, yellow, green, blue Battery available time: about 24 hours continuously Battery power supply: 2 built-in CR2025 button batteries, replaceable Applicable occasions: various celebrations, bars, nightclubs, etc. Features: adding water will emit colorful lights, environmentally friendly Note: It is not suitable for direct pouring of boiling water above 80 degrees. The product contains 2 button batteries for delivery. Product size: caliber 8cm*height 9.7cm*bottom 5.5cm. Notes: 1. Due to manual measurement, please allow an error of 1-3cm. Please make sure you don't mind before buying. 2. Please note that the color may be different due to the difference of the monitor, light, color temperature, and shooting angle, please understand. 3. If you have any questions, please leave a message, we will be willing to solve your problems. It can hold all kinds of (water, juice, beverages, beer, etc.), it will immediately light up and flash, very magical. Suitable for celebrations, parties, bars, gifts, etc. Automatically change the LED color when filled with water or beer. The 3D dragon pattern design around the cup body is fashionable and cool. Water activation: it will automatically glow when the beverage is added to liquid, and it will turn off when there is no liquid. Enjoy different drinking moments with this vivid cup. Packing list: 1* LED flashing color changing mug