radio receiver. ELRS receiver has on board ceramic tower antenna and ipex connector for external antenna. This board also has 16MB Blackbox flash memory on board. The total weight of the board is 4g (w/o RX antenna).

Flight Controller
CPU : STM32F411CEU6 (100MHz)
IMU : ICM-20689
Built-in Receiver : SPI ExpressLRS 2.4G
Receiver Antenna : 2.4GHz SMD ceramic antenna or IPX at your choice
Serial Ports : UART1/UART2
Size : 29mmx29mm
Firmware Version : Betaflight : NEUTRONRCF411SX1280
OSD : Built-in Betaflight aosd
Blackbox : 16MB SPI Flash
Weight : 4g (bare PCB, doesn't count wire)
PCB : 6 LAY-20Z
Onboard RGB programmable LED
BEC : 5V 1.5A

ESC
Voltage : 1s/1s HV/4.2-4.35V)
Current : 5A countinuos and peak 6A (3 seconds)
Current sensor : NO
Support BLHELISuite programmable
Factory firmware : BLHeli_S/Bluejay (O_H_5)
Protocol :Dshot150, Dshot300, Dshot600, Oneshot125, Multishot, PWM