Features

1 Safety arming feature:  Regardless the throttle stick position, the motor will not spin after battery connected. 
2 Throttle calibration funtion: Throttle range can be calibrated to be compatible with different transmitters.
3 User programmable. 
4 Multiple program methods supported: transmitter stick, LED Program Card. Very easy to program the ESC at home or at the flying field.
5 Compatible with Lipo battery and NiCd/NiMH battery.
6 Internal timing can be changed to be suitable for different brushless motors.
7 Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection.
8 Extreme low resistance PCB is used at the power output section, the whole ESC has super current endurance capability.
9 Microprocessor uses separate voltage regulator IC, with good anti-jamming capability.

Hobbywing FlyFun Series 30A 2-6S Electric Speed Control ESC FlyFun-40A W/BEC
Specification

1 Output:  Continuous 40A, Burst 55A up to 10 seconds.
2 Input Voltage:  2-6 cells lithium battery or 5-18 cells NiCd/NiMh battery.   
3 BEC:  FlyFun-40A: 3A / 5V switching mode BEC.
4 Refresh rate of the throttle signal: 50Hz to 432Hz.
5 Max Speed:  210000rpm for 2 Poles BLM, 70000rpm for 6 poles BLM, 35000rpm for 12 poles BLM.
      (BLM = BrushLess Motor)
6 Size:         FlyFun-40A: 60mm*28mm*15mm.
7 Weight:         FlyFun-40A: 38.8g.