Happymodel ELRS X1 AIO 2-4S F4 Flight ControllerThe integrated 2. 4GHz ExpressLRS receiver is equipped with the SX1280 radio frequency chip with high sensitivity, high packet rate and low latency, this flight controller which dispite the small size of this flight controller is able to work at long distances. The flight controller also has reserved 6pin SH1. 0 plug for CaddxFPV Vista HD VTX and a 5pin SH1. 0 plug for analog VTX. Notes: ELRS X1 flight controller many not work with the ELRS 2. 4Ghz TX