This kit allows you to configure a sound-activated robot that moves on two, four or six legs, or traverses hand-over-hand across a horizontal rope (not included), teaching aspiring engineers about stability and mobility in mechanical propulsion. Similar to the way the human brain receives information and sends commands to the rest of the body, the robot has an integrated condenser microphone that detects sound vibrations and transforms them into electric signals, which are converted into electric current and transmitted to the robot's gears, propelling the robot forward or backward. Robot responds to clapping hands or similar sounds. Includes circuit board, mechanical drive system , and detailed instruction manual. Requires two AA batteries. Ages 10 and up. The manufacturer has confirmed that this item meets all U.S. Federal toy safety standards, including safety standards for lead. 6 1/2" H x 3 3/4" W x 5 1/4" L. (8 oz.)