EMAX 1 Piece Simon Series 20A Brushless ESC Support Simonk Multirotor Parts Black Based on Simonk Firmware, Further Optimized to the Perfect Drive Performance and Can be Flashed with Blheli Firmware. Quicker Throttle Response and Better Throttle Linear Continuous Current: 20A Dimension: 52*26*7mm BEC Output: 2A/5V