Create a brilliant light show with LED Coasters! Just place your glasses on the Light Up Coasters and a stunning blaze of bright color will light up from underneath the glass and bathe the entire drink in light! A built in pressure sensor in the center of the Glowing Coasters activates and de-activates the LED Coaster - put your glass onto the coaster and it lights up, take your glass off of the coaster and it turns off. Lighted Coasters use three easy to replace AAA batteries, meaning they can be used over and over again for many parties in the future. These brightly colored beautiful light up coasters are just perfect for galas, banquets, anniversary parties and corporate events.