1Safety protection, no matter where the throttle is, the motor will not rotates when connected to the battery. 2Throttle calibration function, the throttle range can be calibrated to be compatible with different transmitters. 3User programmable. Support a variety of program methods: emitting rod, LED program card. Very easy to operate at home or on the fly. 4Compatible with lithium and nickel metal hydride batteries. You can change the time to suit different brushless motors. 5Full protection such as low voltage cut off protection / overheat protection / throttle signal loss protection. Condition: Item Type: Brushless Motor ESCMaterial: Alloy and Electronic Components Optional Type: A2217 1100KV, A2217 1250KV, A2217 2300KV40A ESC: Features: Safety Protection: No matter where the throttle is, the motor will not rotates when connected to the battery.Throttle Calibration Function: The throttle range can be calibrated to be compatible with different transmitters.User programmable. Support a variety of program methods: emitting rod, LED program card. Very easy to operate at home or on the fly.Compatible with lithium and nickel metal hydride batteries. You can change the time to suit different brushless motors.Full protection such as low voltage cut off protection / overheat protection / throttle signal loss protectionCurrent: 40AOutput Capacity: Continuous current 40A, short current 55A (not less than 10 seconds)Power Input: 2-4 lithium batteries (not included)BEC Output: 5V 3A (Linear voltage regulator mode - linear mode)Maximum Speed: 210,000 RPM for 2-pole motor, 7,000 RPM for 6-pole motor, and 35,000 RPM for 12-pole motorSize: Approx. 68 x 25 x 8mm / 2.7 x 1 x 0.3in2217 Motor:Size: Approx. 27.8 x 32mm / 1.1 x 1.3inWeight: 68 g / 2.4 oz(approx.)Axle Diameter: Approx. 4mm / 0.16inAccessories: 4.0mm pillar adapter, motor mounting base, screwsProps Recommended:2217-1100KV: 11 or 10 inch props such as 1155, 1070, 1060, etc.2217-1250KV: 9-inch prop such as 9050, 9045, 9060, etc.2217-2300KV: 6 inch prop such as 6040, etc. 1 x Set of Motor1 x Set of ESC 1.Pleaseallow0.5and 8209;2mmerrorduetomanualmeasurement.Thanksforyourunderstanding.2.Monitorsarenotcalibratedsame,itemcolordisplayedinphotosmaybeshowingslightlydifferentfromtherealobject.Pleasetaketherealoneasstandard. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.