Features: brand new and high quality The products are driven by the small gears of the motor to drive the large gears, and you can learn the principles of mechanical operation. Green technologies,No batteries required.for Smart assembly, easy and fast! No screwdriver, glue or wire! As long as there is sunlight after the assembly is completed, the solar panel converts light into electric energy to drive the motor and gears to rotate so as to convert electric energy into kinetic energy. Foward Mode: The eyes will turn blue when turned on. Press the switch quickly and the robot dog's eyes turn red. And he will for always go forward. Our DIY building playset for kids is made of eco-friendly and sturdy ABS material. The robot can be put together with screws that never fall out, and you may have it for years. Gesture Control: Wave your hand forward/ backward to move robot dog forward/ backward. Obstacle Avoidance: There is an infrared induction in the product that can capture the obstacles ahead and move forward slowly while avoiding the obstacles. Package Includes: 1 Set Stem Robot Dog Specifications: Material:Plastic Size:Approx.17x15x10cm/6.69x5.51x3.94in Battery:Powered by 4 AAA Batteries(Not Included) note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.