planning to use it for customized build, Please be aware it only support the camera below:

NewBeeDrone BeeEye Camera
Runcam Nano4

Specifications

STM32F411 MCU
ESC Firmware: S-H-40 - Bluejay, 0.16, 48kHz.
ESC Specifications: 4 channel 12A ESC
ESC Connector: JST-1.0 3Pin
NBD OSD(Betaflight OSD Compatible)
Weight: 6.5 grams (including antennas and battery connector)
Size: Outer dimensions 29 x 29 x 7.6 mm
Holes: 25.5 x 25.5 mm
Battery input: 1 – 2 S, connector: PH2.0
UART2 TX and RX for onboard EXPRESSLRS receiver (SX1280)
UART1 TX and RX free
VTX Adjustble power 5mW-25mW-SmartMAX .SmartMAX will automatically adjust the VTX power according to the board temperature. When the board temperature rises, the VTX power will be automatically reduced. When the temperature is low, the maximum output power can be up to 400mW

Includes

1 x BeeBrain BLV4 Flight Controller
4 x Grommet
4 x Screw
1 x Receiver T-Antennas
1 x Receiver Antennas
1 x VTX Antenna

Firmware:
1. BeeBrain blv4 ELRS3.0 receiver firmware
2. BeeBrain blv4 ELRS2.0 receiver firmware
3. BeeBrain blv4 ELRS Betaflight 4.4 firmware

All firmware can be found on our Github Page

Note: Binding process. power up the drone 3 times, on the third time you plug in power, the ELRS Receiver will get into binding mode. We are still trying to work on the ELRS firmware and make it able to just click the boot button to get into bind mode. Will get this update in the near future.
Check out the video below CiottiFPV show you how to get into bind mode. - Thanks bro for showing this. lol