Point absorbers, often simply called a buoy, are relatively small devices in comparison to other WEC types (Fig. 4b). They are typically cylindrical in shape and constrained to one major motion degree, usually up-and-down. They are generally significantly smaller in diameter than a wavelength .A point absorber harvests energy in all directions through its movements at/near the water surface. The PTO system may take a number of forms as the following main projects.