LED Cup, YOKKAO Light-up Cup Water Inductive Rainbow Color Changing Flash Light [400ML] for Home/ Bar/ Party/ Celebration (Square Cup) HIGH QUALITY - Made of high quality clear acrylic, durable. clear acrylic plastic make sure the lifetime of uses,long service life,automatic flicker. HIGH EDDICIENCY - High efficiency and energy saving, through the two button cells, light LED lamp, Use up can be replaced electron. ENJOY DRINKING MOEMNT - Flickering in the darkness with dreamlike feeling,make you enjoy different drinking moment with this vivid mug. SUIT TO - Perfect for party and house decoration uses, suitable for parties, bars, characteristics, wedding party with activity. SENSITIVE TOUCH - Once you pour water, wine or juice into the LED cup, it will light up and will not stop until you drunk or drained the water.