Hobbypower Emax SimonK Firmware 20A ESC Speed Controller EBC 5V 2A for FPV Quadcopter (pack of 4pcs) Based on Simon K firmware, further optimized to the 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.