Feature: 1. LIGHTWEIGHT BUT POWERFUL SYSTEM: Crafted through composite and insert molded plastic, this EDF features a lightweight power system with exceptional rigidity and toughness, ensuring optimal performance for your model aircraft. 2. BALANCE AND EFFICIENCY: The balanced blades and coordinated duct design deliver sound and efficiency comparable to metal, providing enhanced performance and a superior flight experience for hobbyists. 3. EXCELLENT HEAT DISSIPATION: Designed for superior thermal management, this EDF ensures your engine operates at maximum efficiency while extending its lifespan, offering reliability and consistent performance during flights. 4. SUPERIOR ANTI INTERFERENCE DESIGN: This ducted fan is carefully engineered to offer strong anti interference properties, making it easy to install and remove, allowing seamless integration with your model aircraft setup. 5. OPTIMAL SPECS FOR GREAT PERFORMANCE: With a ducted version of 5S 3750KV, maximum voltage of 21V, maximum current of 41A, and maximum thrust of 1050g, this EDF is designed to deliver impressive power and reliability in your aviation model projects. Specification: Item Type: EDF 50mm 11 Blades Ducted Fan Material: Plastic Duct Version: 5S 3750KV Maximum Voltage: 21V Maximum Current: 41A Maximum Thrust: 1050 g / 37 oz(approx.) Loaded Power: 861W Recommended Battery: 5S 1800mAh 35C Recommended ESC: 5S 40A Banana Connector: Diameter 3.5 . Package List: 1 x EDF Ducted Fan 1 x Instruction Manual