1. The quadruped robot series products are assembled by ,which can enhance the hands-on ability and creativity of children. 2. The products are by the small gears of the motor to drive the gears,and you can learn the principles of mechanical operation. 3. Green technologies,.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 energy into electric energy to drive the motor and gears to rotate so as to convert electric energy into kinetic energy. 4. Brand new and high quality.The Best Birthday Gifts . Name:Solar Powered Electric Mechanical Dog Model:Self-Install Dog Age Range: 5 year Style:Puppy Battery:Solar or Battery Note:You need to assemble it yourself Colour:As Shown Material:ABS+electronic components Size:12x6x7.5cm Package Contents: 1 * Self-Install Dog Toy Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.