A buoy of the present invention requires a structure for generating an electricity in an up-and-down movement of the buoy, wherein the buoy has a rotary shaft at a center thereof, and at the end of the rotary shaft, a plurality of neodymium magnets are installed thereto. Furthermore, a coil corresponding to each magnet is wound on an inner edge side of the buoy at an outside thereof. A circular frame attached with the magnet has a tension that rolls inward such as a self-winding tape measure. A fishing line is exposed downwardly below the buoy from the circular frame and is fixed to a small-size anchor on a floor.
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