Unboxing of dual transducer soanar ultrasonic antifouling system. Electronically protects your boat hull from marine growth when stationary at the marina dock. Uses ultrasonic energy pulses which vibrate the hull and water around the hull annoying enough to algae and other marine growth that it does not attach to your hull. Saving the headache of bottom paints, haul-outs, maintenance, ruining your gelcoat.