Features: Safety arming feature: Regardless the throttle stick position, the motor will not spin after battery connected. Throttle calibration funtion: Throttle range can be calibrated to be compatible with different transmitters. User programmable. Multiple procedure methods supported: transmitter stick, LED procedure Card. Very easy to procedure the ESC at home or at the flying field. Timing can be changed to be suitable for different brushless motors. This is the most popular mini servo. Only weighs 9 gram and gives you a 1.5-1.7kg/cm (4.8V-6V) torque. Pretty strong regarding its size. Full protection: low voltage cutoff protection / over-heat protection / throttle signal loss protection. Specification: ESC Parameters: Current: 40A Output Capacity: Continuous Current 40A, Short-time Current 55A (not less than 10 Seconds) Power Input: 2-4 Lithium Batteries(Not Included) BEC Output: 5V@3A (Linear Regulator Mode - Linear Mode) Maximum Speed: 210,000 rpm for 2-pole Motor, 7000 rpm for 6-pole Motor, 35,000 rpm for 12-pole Motor Size: (Approx) 68x25x8mm 9g Servo Parameters: Size: 21.5mmX11.8mmX22.7mm Weight: 9 grams No Load Speed: 0.12 sec / 60 deg (4.8 V) Locked-rotor Torque: 1.5-1.7kg/cm (4.8V-6V) Operating Temperature: -30~~+60 degrees Celsius Dead Zone Setting: 5 Microseconds Working Voltage: 4.8V-6V MotorParameters: KV: 2200 Ri(M ): 0.033 Battery: 2-3Li-Po Max Power: 342W Test Prop: 7x3/7x4 Motor Size: 27.5x38mm Shaft Diameter: 3.17mm Package Information: Package Size: 7*5*2cm Package Weight: 135g Plastic Package Packing List: 1* 2200KV Motor 1* 40A ESC(XT60 Plug) 2* 9g Servo 2* 6035 Propeller 1* Some Other Fittings