The clear pebbles illuminate with the color of the LED lights. The pebbles float back and forth as you change the pens position. Choose from 7 different colors to view constantly, or pick the rainbow setting which cycles through each color! NOTE: Image reflects pen’s “Still” and “Rainbow” function. Each Pebble Pen contains 7 different color options. Some colors not reflected in image. Dimensions: Height: 5.75 in. , 14.61cm. Width: 0.62 in. , 1.57 cm. LED Colors: 1 Blue, 1 Jade, 1 Red Batteries: Includes 3 Replaceable AG3 Batteries.