HobbyWing Flyfun ESC 100A for Airplane & Helicopter 550 class heli 3D (Up to 6S Lipo) with BEC 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.Compatible with Lipo battery and NiCd/NiMH battery.Internal timing can be changed to be suitable for different brushless motors. Multiple program methods supported: transmitter stick, LED Program Card. Very easy to program the ESC at home or at the flying field. Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection.Microprocessor uses separate voltage regulator IC, with good anti-jamming capability. Extreme low resistance PCB is used at the power output section, the whole ESC has super current endurance capability.