Caroute S400-48V 180LB Electric Boat Trolling Motor with speed controller 180 Pound Large Thrust Saltwater For DIY Electric motor with a speed controller and a power switch with IP56 waterproof grade, suitable for boats to 4.0 tons. Higher efficiency, achieve 65% efficiency, 30-60% higher than brushed motors and 100-200% higher than gasoline engine. Much quieter than same power gasoline engine and half to one third the weight. Motor Controller protects motor, battery and user: Low-Voltage protection, overheating protection, stall protection, sudden start protection, and reverse polarity protection. Rugged engineering, sealed motor, galvanic design, sacrificial anode for trouble-free saltwater operation.