Description: 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 fit all 1/10 brushless cars-multi-mounting system for M3 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. ROAR legal. 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: Motor: RPM: 4370KV Max Current: 66A Max Watts: 820W Can Size: 3650 Sensored: No Shaft Length: 15mm Bullet Connector: 4mm Max voltage: 7.4V(2S)-11.1V(3S) Electric Speed Controller: Cont. Current: 45A Burst Current: 260A/10sec Battery: 2-3 Cell Lipo / 4-9 Cell NiMh SBEC: Yes SBEC Output: 5.8V/3A Power Supply Plugs: T Male Motor Plugs: Female 4mm Bullet Connector Package Includes: Motor Size: 64 x 36mm/2.5 x 1.4inch(Height x diameter) ESC Size: 43 x 33 x 34mm