This transparent toy robot helps children to understand mechanical concepts as soon as possible and to improve children's observation skills. You can see the gears inside. Colorful toy robot is equipped with a universal electric motor, colorful lights, analog mechanical gears and pleasant sound effects. The robot uses a transparent housing, is equipped with lights and music, and you can directly see how each gear works. This robot toy with transparent light and sound is a good gift for birthdays or Christmas. Not only can they improve family relationships, but they can also educate children to understand the principle of robot movement from detailed parts. Works with 3AA Batteries (Not Included)