About this product
The JHEMCU GS405A AIO features an F4 FC and a 5A ESC with built-in ELRS 2.4GHz receiver. This is an ultra-light 3.3g brushless AIO flight controller with 25.5x25.5mm mounting pattern!! This FC can handle 5A of continuous current and up to 2S. This AIO also features a built-in 8MB blackbox, buzzer interface, and camera interface.
GSF405A AIO FC has the built-in full ELRS receiver, connected on the UART1 port. It is not an SPI receiver, so it the ELRS firmware can be updated via Wi-Fi or Betaflight serial passthrough. 
Features
5 serial ports (UART1, UART2, UART3, UART4, UART6), one I2C port, and one SBUS interface.
Built-in 8MB blackbox and BMP280 barometer, buzzer interface, camera interface.
ELRS firmware target is DIY_2400_RX_ESP8285_SX1280
Onboard a WS2812 LED light, and WS2812 LED pads
Built-in ELRS 2.4GHz Receiver
F4 Flight Controller
5A 1-2S ESC
EXPRESSLRS 2.4GHZ RECEIVER
Slow flashing: No transmission signal received
Firmware: DIY_2400_RX_ESP8285_SX1280
Working Agreement: CRSF (Betaflight)
ELRS receiver indicator status:
Steady on: Received transmit signal
Double flash: code matching mode
Frequency: 2.4GHZ
ELRS Linking Steps:
1. Connect USB to power the flight controller.
2. After inserting the USB for the first time, disconnect the USB as soon as the LED on the receiver turns off.
3. Repeat the operation twice.
4. When the USB is inserted for the third time, the LED will start to flash double, and the receiver will enter the code matching mode.
F4 FLIGHT CONTROLLER
UART: UART1 (ELRS), UART2 (external RC), UART3, UART4, UART6
Receiver: ELRS (CRSF), TBS (CRSF), SBUS, IBUS, DSM2, DSMX
Support programmable LED such as WS2812
Gyroscope/Accelerometer: MPU6000
Built-in voltage and current sensors
Size: 25.5*25.5MM M2
Barometer: BMP280
Weight: 3.3 grams
CPU: STM32F405
Black box: 8MB
Support buzzer
USB: micro usb
OSD: AT7456E
IIC: Support
BEC: 5V
5A ESC
Support PWM, Oneshot125, Oneshot42, Multishot, Dshot150, Dshot300, Dshot600
Firmware: BLHELI_S S_H_50_REV16_7.HEX
Input voltage: 1S-2S Lipo
Continuous current: 5A
Includes
1x JHEMCU AIO Board - GSF405A F4 FC + 5A 1-2S ESC w/ Built-in ELRS 2.4GHz Receiver
4x M2x6.5mm Rubber Shock Absorber
1x 470uf 35V Capacitor
1x 2.4GHz Antenna
1x 2S Series Board
1x 2mm Plug Cord