Happymodel ExpressLRS ELRS F4 2.4G Flight Controller AIO 5in1The world's first AIO 5in1 F4 flight controller with integrated SPI 2. 4GHz ExpressLRS receiver has been launched. The flight controller integrates SPI controlled 2. 4GHz ExpressLRS receiver, Dshot protocol 4 in 1 ESC, 5. 8GHz 40ch video transmitter and Betaflight OSD. Ultra small size and ultra stable remote control range can improve the range of the original SPI receiver. And because the 2. 4GHz ExpressLRS receiver is equipped with the SX1280 radio