HOBBYWING Flyfun 30A ESC for R/C 400/450 class heli sports Small scale fixed-wing airplane 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.