Home Wind Turbine Generator 5-Blade 500W Max/12V - Low Wind Model Innovative 5-blade design to maximize energy output at low wind conditions under 25 mph. 60% MORE energy output at LOW wind than 3-blade turbine Reliable two-moving-part matainenance free design, Nearly silent operation Controller Electric speed limitation, blade over-speed braking Strong Neodymium magnet PMA, Nylon fiber composite blades