Side-Power's new range of proportional speed control DC thrusters allow you to select the power you need for precise boat movements in any weather and sea conditions. The unique hold feature allows you to keep the boat in position at dock or in locks. Sealed gearleg Power: 4.4kW at 21 Volts Internal Tunnel Diameter: 185mm Propulsion System: Twin, 5 blades Boat Size: 35 - 48' Battery Capacity: 570 CCA SAE 24VDC