To activate your LED Glow Cup, press the button on the bottom to choose 1 of many individual colors or set it to transition through all the colors of the rainbow. Dimensions: Height 4.37 in. Width 2.24 in. Volume 12 oz. filled to brim LED Colors: 1 Blue, 1 Jade, 1 Red Mood Lights Frosted Plastic Glass includes 3 replaceable AG13 Batteries.