Features: The set includes a 3900KV brushless motor, a 60A ESC, 25KG digital servo, programming card and heatsink, which is perfectly fit for the 1/8 1/10 RC car and is designed to provide both quality and performance at an affordable price. The ESC Features enhanced throttle response, excellent acceleration, strong breaks and throttle linearity. Supports program card to make adjustments. High purity copper windings maximize efficiency, a precision-balanced rotor, smoothness for best reliability and maximum RPM. Efficient and high-speed ball bearings, precision-engineered for maximum energy conversion. Multiple protection Features: Low voltage cut-off protection for lithium battery, over-heat protection, Throttle signal loss protection, motor blocked protection. Specifications: Name: 3650 RC Brushless Motor and Brushless 60A ESC 3650 RC Brushless Motor: KV(RPM/Volt): 2300KV/3100KV/3900KV4300KV Optional Watt: 850 Max RPM: 60000 Max Voltage: