Features: Safe Material. The flute cups are made of food-grade plastic, with no adverse effects on human health. Safe for drinking. Liquid Activated. Two tiny pins on the bottom activate the LED. The light turns on when liquid is poured into the cup and turns off when the cup is empty. Creates a pretty effect as the colored light reflects off the sparkly crystals embedded in the bottom of the glass and shines through the liquid. The LED life can last up to 24 hours total using CR1220 button batteries. Can also be used as a normal champagne glass. Eye-Catching. A fun novelty item for parties and gatherings. Draws attention in a well-lit room and stands out in dim lighting, especially in multi-color mode. Adds a festive and vibrant atmosphere. Perfect Gift. Champagne glasses make a great gift. Colorful LED cups create a festive mood and a decorative way to serve champagne or wine. Ideal for club decor, Halloween, home decor, bar events, birthday parties, and other celebrations. Note: Actual color may vary slightly from the image due to differences in monitor displays and lighting conditions. Specification: Material: PS Size: 6.8 x H18cm, Caliber 5.2cm Volume: 150ml Includes: 6 x Cups