Windmill (DB-400) 400W 12V Wind Turbine Generator kit FEATURES: Made for both land and marine. Integrated automatic braking system to protect from sudden and high wind speed. Easy DIY installation methods with all materials provided. Can be used in conjunction with solar panels. MPPT Maximum power point tracking built into the wind turbine generator. Made with high quality Polypropylene and Glass Fiber material with a weather resistant seal. PROTECTION AGAINST: Salt water corrosion, UV protection coating, Sudden voltage surge and wind gust, high wind speeds with integrated automatic braking system + manual braking switch and over charging of battery. SPECIFICATION: Rated power: 400W, Rated speed: 28 mph, Voltage system: 12V, Cut-in wind speed: 6.7mph, Suggested battery capacity: 50A or larger, Number of blades: 3, Rotor diameter: 4 ft and Light weight: 25 lb. INCLUDES: 1 x Center piece + tail (including generator + MPPT), 3 x Blades, 1 x Nose cone, 1 x Manual brake switch + voltmeter display box, 9 x Hex bolts (Large), 2 x Hex bolts (Small), 1 x Hex key, 11 x Nuts, 20 x Washers, 1 x Unilateral open wrench and 1 x Operational installation manual. WARRANTY: 1 Year manufactures warranty.