A shark repellent system for repelling sharks away from an individual while boating. A capacitor is connected between a connector that interconnects the two resistors and a GND of 6 a printed circuit board. In formula, m is 2 or 3, R2A is a divalent group when m=2 or a trivalent group when m=3. A metal adhesive is placed between the first and second films to provide an assembly. Two side gears of the differential mechanism and two motors are connected in one-to-one correspondence by means of two wires through the pulleys, and the remaining motor and the universal joint are connected by means of the remaining wire which is passed through the wire guide.