Rainbow Magic Color Cup with LED Light Party Mug, Birthday Gift Mug, Multicolor, 250ml, 7 Colors Changing Liquid Activated Mug This cup is environmental protection transparent shine cup when pour into liquid (water, beverage, beer, etc), it will flash immediately, very magical, suitable for celebrate, party, bars, gifts and so on. if no water in the cup it will not flash up. Suitable for: bar, discos, restaurants, party, friends gifts, etc. Bright colorful and fun beverage glass with assorted colors flashing in the bottom. Attract the attention of everyone at the party with this fun, bright, and colorful flashing mug.