Happymodel Crazybee F4 PRO V2.1 2-3S Flight Controller 5A ESC & Compatible DSM2 Frsky Flysky RX for Sailfly-X RC Drone

Happymodel Crazybee F4 PRO V2.1 2-3S Flight Controller w/ 5A ESC & Compatible Receiver for Sailfly-X RC Drone

Specification:
Brnad Name: Happymodel
Model: Crazybee F4 PRO V2.1
Item Name: Crazybee F4 Flight Controller built-in 5A ESC & Receiver
Optional Receiver Version: Without Receiver/ Compatible Frsky Receiver/ Compatible Flysky Receiver
                                            / Compatible DSM2/DSMX Receiver
MCU:STM32F411CEU6 (100MHZ, 512K FLASH)
Sensor: MPU-6000(SPI connection)
Board size: 28.5 * 28.5MM
Power supply: 2-3S battery input (DC 7.4-13V)
Built-in 5A(each) Blheli_S 4in1 ESC Dshot600 ready
Built-in Receiver ( Diffirent version having diffirent receiver,   without receiver version doesn't have rx)
Built-in Betaflight OSD(SPI Control)
Built-in Current meter Max 28A
Current meter scale set to 1175
Built-in 5V 1A BEC with LC filter
Built-in voltage detection
Firmware
(Frsky version) CRAZYBEE F4FR PRO V2.1 Firmware target: CrazybeeF4FR
(Flysky version) CRAZYBEE F4FS PRO V2.1 Firmware target: CrazybeeF4FS
(DSM2/DSMX version) CRAZYBEE F4DX PRO V2.1 Firmware target: CrazybeeF4DX
(No RX version) CRAZYBEE F4 PRO V2.1 Firmware target: CrazybeeF4DX

Onboard 5A 4 In 1 ESC