Specifications:

This cup is environmental protection transparent shine cup, when pour into liquid (water, juice, beverage, beer, etc),
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it will light up and flash immediately, very magical.
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Suitable for celebrate, party, bars, gifts and so on.  
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Auto change LED color (red, yellow, blue, green) after fill in water or beer.
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Water activated: it glows automatically when drinks are added liquid, and it will turns off when there is no liquid left.
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Type: LED Glowing Cup
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Material: Plastic
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Power by: 2 x Button Batteries(Included)
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Capacity: 300ml
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Occasions: Pub, Club, Party, Cocktail, Halloween, Xmas, Wedding, etc
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Features: Party Supplies, Color Changing, LED Flashing
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Size: 10cm x 9cm/3.94" x 3.54" (Approx.)
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Notes:
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Due to the light and screen setting difference, the item's color may be slightly different from the pictures.
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Please allow slight dimension difference due to different manual measurement.
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Package Includes:
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1 x LED Glowing Cup