Condition:new Controller System: Electromagnetism Started Wind Speed: 2.0 M/S Cut-in Wind Speed: 2.5 M/S Rated Wind Speed: 18 M/S Max Wind Speed:? 40 M/S The Instantaneous Maximum Wind Speed? 45m/S Blades Quantity:2 Rotor Diameter of Blades:0.54m Speed Regulation: the Wind Engle Automatically Color: White Rated Voltage: 24v Dc Rated Power: 400 W Max Power: 450 W Enerator Protection Grade: Ip65 Work Environment Temperature: 25+45? Over Speed Protection: Electromagnetic Brake Feature: Low Vibration, Low Start Wind Speed Blade Material: Glass Fiber Generator: Maglev Generator Design Service Life: 1015 Years Installation Instructions:not Included Brand: Unbranded.