Features: Precision balanced rotor, smoothness for best reliability and maximum RPM. Excellent torque and long-run times. Direct-solder wiring tabs for flexible soldering options. Dual-ball bearings design. Multiple conservation Features: Low voltage cut-off conservation, over-heat conservation, throttle signal loss conservation. For 1/8 1/10 RC car, RC boat. If there are any problems, please contact our store in time. We will give you a satisfactory solution. Specifications: Name: RC Motor and ESC Watts: 900W Max Voltage: <16V Max Amps: 56A KV(RPM/Volt): 3100KV Max RPM: 50000 Diameter: 36mm Length: 50mm Shaft Length: 15mm Shaft Diameter: 3.175mm Plug Type: 4mm Golden Banana Plug 120A ESC Specifications: Continuous Current: 120A Burst Current: 480A / 10sec Battery: 2-3s LiPo / 4-12s NiMh BEC Output: 5.3V / 5A(Switch Mode) Power Supply Plug: T Male Motor Plug: Female 5mm Bullet Connector Size: Approx. 43 * 31 * 32mm Package Information: Package Size: 10*6*5cm Package Weight: 310g Plastic Package Package Listing: 1* 3100KV Brushless Motor 1* 120A Brushless ESC 1* Heat Sink