Descriptions: 1> Motor: 4 poles Hi-torque motor design. CNC machined 6061 T6 billet alumium heatsink can. High purity copper windings maximizes efficiency. High RPM ABEC5 oversized bearings. Universal fits 1/18 brushless cars-multi-mounting system for M2.5 screws. Precision balanced rotor, smoothness for best reliability and maximum RPM. Stator - Super Thin (0.35mm) laminations. Removable/replaceable. Precision engineered for maximum energy conversion. 2> 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. Multiple protection features: low voltage cut-off protection, over-heat protection and throttle signal loss protection. Specifications: 1> Motor RPM: 7200KV Max Current: 24A Max Watts: 200W Can Size: 2430 Sensored: No Shaft Diameter: 2mm Shaft Length: 12mm Bullet Connector: 3.5mm Max voltage: 7.4V(2S) 2> Electric Speed Controller: Cont. Current: 25A Burst Current: 90A/10sec Battery: 2 Cell Lipo / 4-6 Cell NiMh BEC: Yes BEC Output: 5V/1A Power Supply Plugs: T Male Motor Plugs: Female 3.5mm Bullet Connector Motor Size: Approx. 41 x 24mm/ 1.6 x 0.9inch(Height x diameter) ESC Size:Approx. 37 x 26 x 14mm/1.5 x 1 x 0.6 inch Package Included: 1pc * 2430 7200KV 4P Sensorless Brushless Motor 1pc * 25A Brushless Electric Speed Controller 1pc * manual