SKU: 2063593570

Happymodel ExpressLRS ELRS 2G4 F4 Whoop AIO Flight Controller

Sale price$74.69 Regular price$82.99
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Description

Happymodel ExpressLRS ELRS 2G4 F4 Whoop AIO Flight ControllerThe worlds first AIO 5in1 F4 flight controller with integrated SPI 2. 4GHz ExpressLRS receiver has been launched. The flight controller integrates SPI controlled 2. 4GHz ExpressLRS receiver, Dshot protocol 4 in 1 ESC, 5. 8GHz 40ch video transmitter and Betaflight OSD. Ultra small size and ultra stable remote control range can improve the range of the originals SPI receiver. And because the 2. 4GHz ExpressLRS receiver is equipped with the SX1280 radio

The world’s first AIO 5in1 F4 flight controller with integrated SPI 2.4GHz ExpressLRS receiver has been launched. The flight controller integrates SPI controlled 2.4GHz ExpressLRS receiver, Dshot protocol 4-in-1 ESC, 5.8GHz 40ch video transmitter and Betaflight OSD. Ultra-small size and ultra-stable remote control range can improve the range of the originals SPI receiver. And because the 2.4GHz ExpressLRS receiver is equipped with the SX1280 radio frequency chip with high sensitivity, high packet rate and low latency, this flight controller is the one that all Race/Freestyle pilots needed. It is suitable for use in Tiny whoop Race or Toothpick Freestyle, and can also be used in 1S ultra-lightweight Nano Long Range platform.

Check out all our Flight Controllers and the rest of our HappyModel Express LRS Products!

Specifications:

  • Brand Name: Happymodel
  • Item Name: F4 2G4 Flight Controller Set
  • Betaflight Firmware/Diff document: Click Here
Flight controller 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 ExpressLRS 2.4GHz receiver, Built-in 5V 1A BECFlight controller firmware target: CRAZYBEEF4SX1280
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 SPI ExpressLRS 2.4GHz Receiver Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz
RF Frequency: 2.4GHzAntenna : SMD antenna
Telemetry output Power: <12dBmReceiver protocol:  SPI ExpressLRSCould bind with Happymodel ES24TX , ES24TX Lite, ES24TX Slim and DIY 2.4GHz ELRS TX module(need to flash the same version ELRS firmware)
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
Onboard voltage and Amperage meters  settings Voltage meter scale setting 110
Amperage meter scale setting 1175


Bind procedure:

1. Power the flight controller by connecting USB. Please make sure that the port driver of the flight controller is correctly installed on the computer, then open Betaflight Configurator(Latest version) to connect, enter to the “receiver” interface, and then click “Bind Receiver”, the red LED at the bottom of the flight controller will flash quickly, which means that the SPI ELRS receiver enters the bind mode. There is another way to make the receiver enter the bind mode: after connecting to the Betaflight configurator, move to the CLI interface and enter “bind_rx” in the command line.

2. After correctly connecting the ES24TX or ES24TX Lite/Slim module or DIY 2.4G ELRS TX module to your Opentx radio transmitter, copy the latest version of ELRS.LUA file to the SD card in the remote controller. The directory is “SD Card/Scripts/tools”, Then run ELRS.LUA and upgrade the specified TX frimware through Wifi, and then click “bind” to link with the SPI ExpressLRS receiver. Note: You need to adjust the Packet Rate to 500Hz from the ELRS interface of your radio controller before binding.

3. After the binding is successful, the Red LED at the bottom of the flight controller will getting to be solid, and the telemetry can be received at the same time.

4. The meaning of the LED status of the SPI receiver: the LED is getting to be solid, indicating that the bind is successful or the connection and communication is normal, the LED flashing quickly indicates that the receiver is in binding mode, and the LED flashing slowly indicates that the there is no signal received from the radio controller.

Notes: 

Since Betaflight has not yet released the official firmware that could supports the SPI Expresslrs protocol, the current version is the Beta version(Target:CrazybeeF4SX1280). Betaflight will update to their official target soon. Please feel free to contact with us if you have any issues with this Beta version Firmware.

Package Includes:

  • 1 x F4 2G4 Flight Controller Set

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 2063593570

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Blonde97
Pawtucket, US
★★★★★ 5
Worth every single penny.
Color: gray
I haven’t had this kit in my car for very long, but it has definitely come in handy. Especially when people leave their blown out tires in the middle of the interstate and you accidentally run it over because the traffic is so bad you can’t see it coming and it knocks the plastic protectant piece loose from under your car and starts making an awful sound because it’s being dragged across the ground on the interstate. I pulled over and used one of the zip ties in this kit to hold it up and it’s still holding it up quite nicely I might add. This is something definitely worth having around because you never know what may come your way in life.
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Reviewed in the United States on December 18, 2025
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Janet_A
Port Orchard, US
★★★★★ 4
Great Emergency car kit equipments
Color: Black, Color: Black
I bought the used/resale price at $33 instead of $48 new price. Nothing actually looked used. Most of the items are of great quality! - was actually surprised. Get this if you're looking for a budget friendly roadside emergency car kit with multiple useful items with great quality.
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Reviewed in the United States on February 15, 2026
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Jean
Carnegie, US
★★★★★ 5
Great emergency kit for the car
Color: Blue
This roadside emergency kit is very useful to keep in the car. It comes with many important items for unexpected situations, feels well organized, and gives extra peace of mind while driving.
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Reviewed in the United States on May 24, 2026
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Sarah T.
Charlottesville, US
★★★★★ 5
Nice gift
Color: Blue
New driver in the family so this was a decent gift for the price
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Reviewed in the United States on April 24, 2026
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Got this for my little brother for his birthday he absolutely loved it!
Phoenix, US
★★★★★ 5
Great to have in car
Color: Blue
I’m so glad I bought this roadside assistance kit. It gives me so much peace of mind knowing I have the basics I might need in an emergency. Everything is organized, easy to store in my trunk, and feels good quality. It’s one of those things you hope you never have to use — but you’re really thankful to have just in case.
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Reviewed in the United States on February 27, 2026

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