Description: Electric Speed Controller Compatible with sensorless brushless motors. High anti-interference capability. Using advanced software interface to set up or update the software. Super smooth and accurate throttle linearity. Fast response to throttle input. Mutiple protection features: low voltage cut-off protection, over-heat protection and throttle signal loss protection. Specification: RPM: 4500KV Max Current: 22A Max Watts: 300W Can Size: 2435 Can Diameter: 24mm Can Length: 35mm Shaft Diameter: 2mm Shaft Length: 12mm Bullet Connector: 3.5mm Weight: 58.3g/2.1oz Max voltage: 7.4V(2S)-11.1V(3S) Package Includes: 1 x 2435 4500KV 4P Sensorless Brushless Motor 1 x 25A Brushless Electric Speed Controller Note: Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, Thank you!