This EMAX ECO II 3115 motor is perfect for drone enthusiasts looking for high-performance motors. It comes with multiple KV options (400KV, 500KV, 640KV, 900KV) to fit different drone setups. The motor features high performance, advanced cooling technology, and durable construction. For the 400KV option, recommended propeller is 10', idle current at 10V is 0.6A, internal resistance is 130, voltage range is 10 - 12S, max power is 1970W, and peak current is 41A. For 500KV, recommended propeller is 10', idle current at 10V is 0.8A, internal resistance is 95, voltage range is 8 - 10S, max power is 1960W, and peak current is 49A. For 640KV, recommended propeller is 10', internal resistance is 66m, idle current at 10V is 1.2A, voltage range is 6 - 8S, max power is 2016W, and peak current is 63A. For 900KV, recommended propeller is 9' - 10', internal resistance is 42m, idle current at 10V is 1.7A, voltage range is 4 - 6S, max power is 2120W, and peak current is 85A. It includes 1x EMAX ECO II 3115 Motor (Choose Your KV) and 1x Hardware Kit.