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The reel itself does not have power, and the cable reel is driven by the rotary motion of the electrical equipment. The cable reel is equipped with a sprocket or gear, and the cable is taken in or released synchronously with the electrical equipment. By adjusting the gap between induction disc and permenent magnet disc, it adjusts the torque and protects the cable from being torn off, and is suitable for various occasions that need to move the cable for power supply.