HAHAone [ Motorial Alien Robot ] Robotic Building Set Block Toy ,Battery Motor Operated,3D Puzzle Design Alien Primate Robot Figure for Kids and Adults , Sturdy Enough , 120 Parts(Elf Knights) Two of them can be combined to one as the picture show.Combine all the sets in the series to create the ultimate creature, including classic rods and connectors.Hops along like a primate/Alien Strongly recommend to see the great Video at http://www.iqiyi.com/w_19rrma5aut.html  to how fun the robot works Powered By A High Performance Motor And Will Do Some Simple Actions According To Your Instructions After you Complete Assembling It..Robotic Motorized Walking Toy Will Help Improve Children's Imagination and Creativity. Adults Love This Engineering Design, Appropriate For Every Collector. Requires 2 AA batteries (not included).Battery Operated Robot Toy Is Not Only A Toy, But Also A Good Way To Get Some Knowledge From Fun, Great For Parent-Child Relationship NOTE:There may be a little oil stains which is use for lubrication on the surface of the motor ,just please scrub off it by paper.Order the full set of 4 makes the robots more fun,please research ASIN:B0177WDTOC B0177WKAI0 B0177WZYQ8 B0197PO9OG