Item Type: RC Car Brushless Motor Material: Aluminum alloy, copper and steel Gross Weight: 188g/6.6oz Model: F540 Color: Black and red KV(RPM/Volt): 3930KV Output Power: 820W Maximum Voltage: 1. Due to manual measurement, please allow 1 to 3mm error, thank you 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 1High Torque Rotor Design: The brushless moter adopts 4 pole 12 slot high torque rotor design, and it has low friction, low noise, high accuracy, strong torque and stable output power. 2Applicable: The motor is a has a 3.175mm shaft, which suitable for all 1/10 brushless cars, M3 screws in a variety of installation methods. 3Aluminum CNC Shell: This brushless motor has high hardness aluminum CNC shell, high temperature resistant copper coil, 0.35mm thickness silicon steel sheet, high magnetic permeability, high silicon content, good insulation and heat resistance. 4Built in Temperature Sensor: The brushless mator has built in explosion proof rotor, high toughness stainless steel output shaft, and high accuracy premium bearings to create super durability of the motor.The motor has a built in temperature sensor and interface, which can be used with the ESC to realize the motor overheating protection function. 5Detachable: The detachable structure design is convenient for cleaning and maintenance, which can effectively prolong the service life of the motor and improving work efficiency.