The Elenco Follow Me Robot has four built-in microphones. It detects the sound source and turns and moves towards it. Just clap and the robot will come to you. Clap again from another position and the robot will turn and move in that direction.
The Elenco Line Tracking Robot Kit requires simple hand tools for assembly (screw driver, pliers, cutters).
Requires 4 "AAA" batteries (not included)