Build your own moving crab robot! 4M Table Top Robot Science Kit brings all the parts the robotic scientist needs to assemble a crab shaped robot that can move along any platform. Follow the instructions, put the robotic crab together and watch it crouch along the table or counter top. The mechanical crab is smart! The crab robot is able to 'feel' the edge and make turns not to fall off. Table Top Robot Science Kit requires 1-AAA battery (not included). This fun mechanical kit for children is a great robotic kit for beginners.