3-Blades Helix Wind Turbine Generator DC 12V Vertical Axis Wind Power 400W Note: The controller, screws and flange are fixed in the foam Specification: Condition: New Controller System: Electromagnetism Starting Wind Speed: 2.5m/s Cut-in Wind Speed: 2.5m(98inch)/s Rated Wind Speed: 18m/s Max Instantaneous Wind Speed: ≤40m(1575inch)/s The Instantaneous Maximum Wind Speed: ≤45m(1772inch)/s Blades Quantity: 3 (with Different Colors) Diameter of Blades: 0.6m/24inch Blades Height: 0.8m/31inch Speed Regulation: Automatic Rated Power: 400W Max Power: 450W Generator Protection Grade: IP67 Work Environment Temperature: -40—+60℃ Product Assembly Weight: <10kg/22lbs Over-speed Protection: Electromagnetic Brake Blade Material: Glass Fiber.