KKmoon Emax Simonk 40A Brushless ESC Electronic Speed Controller UBEC for DJI DJI F450 F550 Multicopter Quadcopter Align TREX 450 Helicopter ESC Based on Simon K firmware, further optimized to perfect drive performance. Low-voltage protection, over-heat protection and self-check functions. Separate power supply for MCU and BEC, enhancing the ESCs ability of eliminating magnetic interference. Parameters of the ESC can be set via program card or transmitter. Throttle range can be set to be compatible with different receivers.