This product is assembled by small parts, which can enhance the hands-on ability and creativity of children, driven by the small gears of the motor to drive the large gears, and kids can learn the principles of mechanical operation. Features: Solar powered and battery powered (battery not included), can be using at both day and night. Intelligent assembly, easy and quick, cultivate children's hands-on ability and learn in assembling. No screwdriver, glue or wire required. As long as there is sunlight after the assembly is completed, the solar panel converts light energy into electric energy to drive the motor and gears to rotate so as to convert electric energy into kineticenergy. Vivid and realistic appearance, kids will interested in it. A nice gift for kids, promote parent-child interaction and enhance parent-child relationship. Specifications: Type: Robot Dog, Robot Cattle (optional) Material: ABS Robot Dog size: 120 * 75 * 60mm / 4.7 * 3.0 * 2.4in Robot Cattle size: 140 * 90 * 85mm / 5.5 * 3.5 * 3.3in Robot Dog/Cattle weight: 80g / 2.8ounce Package size: 255 * 203 * 40mm / 10.0 * 8.0 * 1.6in Package weight: 239g / 8.4ounce Packing List: 1 * Robotical Toy