You can remote control it to search for metallic objects on the ground. The metal detecting unit can be detached from the robot body. It is a cool gadget which will fascinate all your friends. You will also learn the principles behind this cute robot to find out how metal detector works. Contains 1 chassis (with axle and gear installed), 1 motor with wires and worm gear, 1 motor cover, 1 metal detector, 1 base plate for eyes, 2 stick-on eyes, 1 switch lever, 1 gear, 1 axle,1 short axle, 1 remote-control with switch and wires, 1 battery cover, 4 terminal caps, screws, washered screw, 1 connecting cable, 4 wheels and detailed instructions. It is 14cm long when built.