The 4 in 1 Robot is an excellent intermediate series robot. This kit can teach the basic principles of robotic sensing and locomotion. It features a pre-assembled printed circuit board, a sound sensor, hardware and mechanical parts. Only basic hand tools are required for assembly. Assembling the robot is a great way to develop fine motor skills and hand-eye coordination as you assemble, build and follow instructions. The most important objective, though, is to just have fun building your robot! The 4 in 1 Robot makes a great entrant for robotic competitions, science fair projects, robotic workshops, after-school programs, special events, gifts, science enrichment camps, and classroom activities. The Robot features four different methods of movement: Traversing-hand over hand (orangutan mode), Two-legged walking (Gorilla mode), Four-legged walking (Centaur mode) and Six-legged walking (Spider Mode). Requires 2 "AA" batteries (not included).