(Frsky SPI RX version) DiamondF4 FR FC Firmware target: CrazybeeF4FR (Flysky SPI RX version)DiamondF4 FS FC Firmware target: CrazybeeF4FS MCU:STM32F411CEU6 (100MHZ, 512K FLASH) Sensor: MPU-6000(SPI connection) Original whoop size compatible Power supply: 1S battery input (DC 2.9V-4.35V) Built-in 5A(each) Blheli_S 4in1 ESC Dshot600 ready Built-in Betaflight OSD(SPI Control) Built-in 5.8G VTX Built-in SPI Frsky/Flysky receiver Built-in 5V 1A BEC Onboard 4in1 ESC MCU upgraded to EFM8BB21 Power supply: 1S LiPo/LiPo HVCurrent: 5A continuous peak 6A (3 seconds) Support BLHeliSuite programmable Factory firmware: O_H_5_REV16_8.HEX Default protocol: DSHOT600 Onboard Frsky SPI D8 receiver Version SPI BUS receiver Frsky D8 compatible Compatible Non EU transmitter D8 modelChannels: 8ch Failsafe support No ground interference ( Transmitter and receiver 1 m from the ground): 200m~300m Onboard Flysky SPI receiver Version SPI BUS receiver Protocol: AFHDS and AFHDS-2A Switchable Channels: 8ch(AFHDS) or 14ch(AFHDS-2A) No ground interference ( Transmitter and receiver 1 m from the ground): 200~300m Failsafe support Onboard 5.8g VTX Output power: 25mw~200mw switchable Frequency: 40CH Input voltage: 3.3V 5.5V Current consumption: 300mA(type) Frequency: 5.8GHz 5bands 40 channels(include Race band)Smartaudio ready