The Diabolo is a skill and action, juggling toy. Hold the handles and spin and flip the Diabolo on the string between them. This Diabolo has an insturction guide and a CD-ROM with tricks, movies and more. Inside the Diabolo is a mulit-function LED that changes the color of the Diabolo as you manipulate it. Set it to display one color, change colors through the spectrum, or set it to continuosly flash. Batteries are included.