Motor Specifications Rotational Speed: 3550 RPM/V Continuous Current: 20A Max. Current: 25A Input Voltage: 6 - 16V Max. Efficiency: 97% No Load Current: 0.7A Internal Resistance: 56m ohm Motor Dimensions (Diameter x Length): 25.8mm x 33.3mm Shaft Dimensions (Diameter x Length): 3.14mm x 14.2mm Input Battery Types: NiCd/ Nimh/ Li-po Battery Recommend Model: Helicopter or Airplane ESC Specifications Dimensions: 51mm x 24mm x 8.3mm Sustaining Input Voltage: 6 - 18V BEC Output Current: 5V/3A Continuous Output Current: 30A Max. Output Current: 40A/12s Internal Resistance: 0.0021m ohm Cable Type: 16 AWG (Battery & Motor) Cable Length: 72mm (Battery), 72mm (Motor), 190mm (Receiver) Input Battery Types: NiCd/ Nimh/ Li-po Battery Recommend Model: Helicopter / Airplane ESC Features Auto set Low-Voltage Cutoff function Low resistence High rate PWM User programmable brake Low voltage auto setting based on battery Throttle range self-adjusting Soft start ramp up Runs motor in forward or reverse Auto motor cutoff with reset Safe power arming program ensures motor will not run accidentally after turn on Low torque start Auto shut down when signal is lost Package Included 1 x 3550 Outrunner Burshless Motor (with accessories & English Manual) 1 x RC Smart 30A Brushless ESC (with accessories & English Manual)