Product name:Happymodel CruxF405HD ELRS AIO 3in1 F4 Flight Controller Built-in Serial Port 2.4G ELRS Receiver 20A ESC Precise details: The CruxF405HD ELRS AIO flight controller comes with integrated UART 2.4GHz ExpressLRS receiver and 20A Blheli_s ESC(Bluejay firmware pre-installed) which could support 2-4s battery. Bigger Mosfet could support high to 20A currents would be better for 2-4S toothpick drone or long range FPV drone. Reserved 6 pin socket for DJI HD equipment plug and play. Its a great solution of build HD digital FPV drone . Specifications: Brand: Happymodel Model: CruxF405HD ELRS AIO Flight controller: MCU: STM32F405RGT6 (168MHZ, 1Mbyte FLASH) GYRO Sensor: ICM42688 (SPI connection) Mount hole size: 20mm*20mm Power supply: 2~4S battery input (DC 8.7V-17.4V) Built-in 20A(each) Blheli_S 4in1 ESC Built-in Serial ExpressLRS 2.4G (Default connected to UART2) Built-in BMP280 Barometer Built-in 8MBp blackbox Built-in voltage meter sensor , voltage meter scale 110 Built-in current meter sensor , current meter scale 470 Flight controller firmware target: BETAFLIGHTF4 Onboard 4in1 ESC: MCU upgraded to EFM8BB21 Power supply: 2-4S LiPo/LiPo HV (7v/17v) Currents: 20A continuous peak 25A (5 seconds) Support BLHeliSuite programmable Factory firmware: Bluejay 0.19.2 Firmware target: F_H_40_48_v0.19.2 Default protocol: DSHOT150/DSHOT300/DSHOT600 Onboard UART ExpressLRS 2.4GHz Receiver: Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz RF Frequency: 2.4GHz Antenna plug: IPEX Telemetry output Power: