Joysticks Robotic Arm is a unique project with many surprises awaiting your little engineer to discover. Unlock the safety switch & press on the red power button to start! This Omni-directional Robot Arm can interchangeable 2-claw and 4-claw grippers mode, so kids can grab a whole range of different objects. A young curious engineer can tell how the inner parts work together, for example, connecting rods to pilot planetary gear system or gear movements to active transmission. Through the hands-on assembly, children will not only acquire mechanical knowledge but also build up better problem-solving skills!