【AUTOMATIC ON OFF 】 Just add liquid to activate the flashing multicolored LEDs in the base of the cup. The lights turn off when the cups are empty. When activated, the LEDs flicker, change color and glow in a beautiful changing rhythm that is sure to delight. 【PERFECT FOR PARTIES AND SPECIAL OCCASIONS 】Best drinkware party favors or decoration for Christmas, New Years Eve, birthdays, weddings, shots, bars, night clubs or discos.The lights automatically change colors, enhancing the ambiance and creating a beautiful rhythm. 【ELEGANT CUT GLASS DESIGN】The sophisticated angular design shows off the blinking LEDs for a cool Old Fashioned Lowball glass your guests and friends will remember and covet. 【DURABLE ACRYLIC PLASTIC CONSTRUCTION 】Two long-lasting coin lithium batteries are included and installed in the bottom of the cup. The battery compartment is sealed with a twist on liquid resistant cap. 【SATISFACTION GUARANTEED】We KNOW you'll love these premium LED glasses, but if you don't, we'll take them back - no questions asked. 【AUTOMATIC ON OFF 】 Just add liquid to activate the flashing multicolored LEDs in the base of the cup. The lights turn off when the cups are empty. When activated, the LEDs flicker, change color and glow in a beautiful changing rhythm that is sure to delight. 【PERFECT FOR PARTIES AND SPECIAL OCCASIONS 】Best drinkware party favors or decoration for Christmas, New Years Eve, birthdays, weddings, shots, bars, night clubs or discos.The lights automatically change colors, enhancing the ambiance and creating a beautiful rhythm. 【ELEGANT CUT GLASS DESIGN】The sophisticated angular design shows off the blinking LEDs for a cool Old Fashioned Lowball glass your guests and friends will remember and covet. 【DURABLE ACRYLIC PLASTIC CONSTRUCTION 】Two long-lasting coin lithium batteries are included and installed in the bottom of the cup. The battery compartment is sealed with a twist on liquid resistant cap. 【SATISFACTION GUARANTEED】We KNOW you'll love these premium LED glasses, but if you don't, we'll take them back - no questions asked.