Happymodel ELRS X2 AIO Flight Controller (F4, ELRS 2.4Ghz, 12A, 2-4S)The ELRS X2 flight controller comes with integrated SPI 2. 4GHz ExpressLRS receiver and 12A Blheli_S ESC which could support 2 4s. Bigger Mosfet could support high to 12A currents would be better for 2 4S toothpick drone or long range FPV drone. And because the 2. 4GHz ExpressLRS receiver is equipped with the SX1280 radio frequency chip with high sensitivity, high packet rate and low latency, this flight controller is the one that all Race Freestyle