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 MCU upgraded to EFM8BB21 Power supply: 2-3S LiPo/LiPo HV (7.4v/13v) Current: 5A continuous peak 6A (5 seconds) Support BLHeliSuite programmable Factory firmware: S_H_50_REV16_7.Hex Default protocol: DSHOT600 Onboard Receiver Frsky version: Built-in SPI Frsky receiver with telemetry(D8/D16 switchable) Compatible both Non EU and EU-LBT transmitter Channels: 8ch or 16ch EU-LBT support(need to update betaflght v4.0 date 2019-04-11) Failsafe support No ground interference ( Transmitter and receiver 1 m from the ground): 300m Flysky version: Protocol: AFHDS and AFHDS-2A Switchable Channels: 8ch(AFHDS) or 14ch(AFHDS-2A) No ground interference ( Transmitter and receiver 1 m from the ground): 300m Failsafe support DSMX version: Protocol: DSM2/DSMX compatible Channels:6-9 (Depend on your radio) No ground interference ( Transmitter and receiver 1 m from the ground): 300m No RX version: No RX version support external serial-bus receiver like xm+ crossfire, S-FHSS etc Package Included: 1x Happymodel Crazybee F4 PRO V2.1 Flight Controller