Usage Tips:Features: Safe Material. The flute cups are made of food-grade plastic, there are no adverse effects on human health. Safe for drinking. Liquid Activated. Two tiny pins on the bottom to activate the LED, LED lights up when liquid is poured into the cup , lights off once the cup is empty. A pretty effect as the colored light reflects off the sparkly crystals embedded in the bottom of the glass, then shines through the liquid in the glass. The LEDs life can last for 24 hours in total with CR1220 button batteries. It can also be a normal Champagne glass. Eye-Catching. A nifty novelty item for parties and any kind of get-together, a huge access to be a hit at a party. In a lighted room, it will draw attention, but in dim light, it is a real eye-catcher, especially in the multi-color mode, really pretty and added a fun vibe. Perfect Gift. Champagne glasses make for an awesome gift Colorful LED Cups create a festive mood and a decorative way to serve champagne or wine, Perfect for club decorations,Halloween decorations, house decoration uses, bar birthday decorations, parties decorations, characteristics, Note: Actual color may be slightly different from the image due to different monitor and light effect. Specification: Material: PS Size: 6.8*H18cm, Caliber 5.2cm Volume: 150ml includes:6 x Cups