YM587X An 8" clear plastic ball with a 3-dimensional maze inside and a small metal ball that you have to roll along a track， passing numbered marker points along the way. It has electronic sound and a digital score readout screen. Can develop children’s intelligence and inspire their potential. You will need a steady hand to get all the way around the track without the ball falling off. Powered via USB cable. Package Details Weight: 406.60 g Size: 18.8*17.5*17.3 cm Package Includes 1 × Super Maze Electronic Ball IQ Toy 1 × USB Cable