About the Model: - Build either 2, 4, or 6-legged walking robot powered by single motor. - Use sound activated sensor to control when robot starts and stops. - Simple, easy-to-build design uses small number of parts and pre-built gearbox. - Installation uses no screws, only simple-to-use yet secure push rivets. - Uses two R6/AA/UM3 batteries (Not included). Set Includes: - Sound sensor unit x 1 - Motor x 1 - Universal plate (clear) x 2 - Long universal arm x 4 - Universal bolts x 4 - Push rivets (full set) - Gearbox (pre-built) - Battery case