The Airforce 4.1-5.0 KW wind turbine is independently-tested and CE-certified, utilities gearless, direct drive architecture, unique permanent magnet generator,and integrated SMA inverter to provide best-in-class wind energy capture,carries industry standard 5-year warranty. Product Characteristics: high quality with low price; high efficiency(Cp-0.43); breeze start up-1.8m/s; long lifetime; free of maintenance; light weight, easy installation; heavy wind resist(suvival wind speed-60m/s), low noisy; anti-rust, anti-corruption; damp-proof, water-proof, sand-proof. Gross weight:190kg;packing volume:0.84 cbm.