Equipped with underwater gearbox and submarine motor mini, the Mechanical Swimmer utilizes the motor rotation to move the legs up and down via crank arms. Furthermore, gearbox movement is also delivered to the arms through rubber bands. By changing the position of the head, arms, and legs, the robot can perform three swimming styles. Polystyrene foam is installed within the swimmer's body as a float. Flexible legs are made with 0.3mm thick soft resin and create propulsion to swim. This kit features snap-on easy assembly and requires no cement for assembly.